How to make a product page invisible ?

[Digit_PaxMentis]

About this question I only found two hints, 1st to make a collection invisible, or 2nd: to tag all pages others than I like to hide, and then command via the meta function to keep all visible with this tag. Yet. I have 380 products. I cant do such efforts.

Situation: I double product pages by purpose. The mirror product page is being used for a "one product shop design", for ad campaigns and test markets. A so called 1-product-shop-design" the header/menue and footer are hidden. So a visitor who comes via an online advertising, can only see (by purpose) this one single product. Without any access to the rest of the shop collections. - Naturally such design is being used for test markets, to avoid any disturbing data on this product page.

Yet, in the overview of all products A-Z, these specific promo pages appear for now, and of course, for any user, it looks double ... very annoying. It distracts and confuses a user. And thats not what I want.

How to make these specific promo pages invisible ? Yet, with a shorten URL being used in the online advertising, a user can visit these specific promo pages ?

Invisible here does not mean to set the product page on "draft". It must still be accessible by link sharing.

Please dont offer me an app. Meanwhile for every little function, which I expect from Shopify as "standard", I must integrate an app, and the monthly costs explode. Easily 200-300 bucks per months. With low price products like printable apparels and low commission rates of 17-22 %, such annual expenses of 2500-3500 bucks are no more legit. This was not my plan when I registered the shop in 11/2023.
I had to integrate already 61 apps, just within a short period of 6-7 months. Beside my POD fulfilled services (in total around 5-6) I need for every little function another app, e.g. shorten URL, designing a funnel page, email marketing, digital downloads, bundles etc. .... its total annoying how my shop is blown up by such huge number of apps. 
   Thats ridiculous, and hardly to manage with all the risks which come along (bugs, data privacy etc. ...).  I am not willing anymore to integrate more apps. This has also to do with liability. If something goes wrong during an order process, whom I can make liable ? Regularly for me Shopify is my contract partner. I dont want to deal with 40-50 other companies who deliver these apps.
   It feels meanwhile for me, that Shopify only likes to offer the raw construction framework, and takes itself out of any responsibility delegating even important features to 3rd parties. But this is another topic on its own.

Back to the topic: I already got a code (which I found in a youtube video) I could integrate in base.css to hide a collection in the collections overview. As I have collected all promo product pages in an extra collection this part so far is O.K. - Yet, as mentioned, I need to hide these products in the A-Z / Latest products overview, too. 

Tks in advance giving orientation, for hopefully an easy and quick solution. We have to earn money, and not blowing up an e-commerce shop to a monstrosity, which at the end of the day, is not anymore economic with all the extra tweaking.

[wo]

As I understand it. You just need to exclude all the promoted products from the collection displayed on your website.
I don't know how you create the collection.
Take the collection of all products as an example. Shopify has generated a default collection page: domain.com/collections/all, which contains all products. You can create a collection named "all" to replace the default collection. Then set it to add products to this collection manually or automatically. If you use manual, just put the products you want to put. If you use automatic, you can add a tag to all the products you want to add to this collection, such as: all. Because you have more than 300 products, you can export all products, add tag to the products you want to put in the all collection and then upload them, or directly select all products and add tag. Also, don't put the promoted products in other collections.
In this way, customers will not be able to see your promoted products on the website and can only enter through links.

[Digit_PaxMentis]

Tks, wo. I will think through this. In a kind, it has some logic. I am just scared with the Export and then re-import function, that something might go wrong, e.g. losing extra mockup images or tags. I invest lots of time to create unique mockups, to give the whole shop, the collections and product pages an attractive look.

Here ( https://www.pomshop.nl/shields ) the example of the collection with the relevant products I have now ready for the promotion (each of these product pages has been mirrored as "one-shop page" for the testmarket/online ads campaign).

Rec.: The fulfillment services of the POD (print-on-demand) services dont offer such mockups. So at least in the last 2 months I added to every new product page also unique mockups. - Will these images be gone after re-import of the product pages ??? - Also the tagging is extreme work intensive. Will all tags be re-imported ?

[wo]

In fact, I don't dare to use the import and export function of products easily.
There is a simpler option. You can create an all collection without using tags as conditions.
You can use other conditions such as product type, product category or product vendor. You should have added these when creating the product. If you use product type as a condition, just leave the input box of the promotional product blank.