When I installed Product Filter & Search.
When the page is opened, there will be two quick refreshes, one is the original product arrangement. One is the product arrangement of the app.
This caused the speed to slow down a lot, and when I clicked in the product and then backed up. He will return to the title position of the previous page. It's not like returning to the previous position.
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This is an accepted solution.
Unfortunately the best way to not make this happen is find another app or you would need to make the element yourself
You can try Ultimate Product Filter+Search since it's the most lightweight and fully customizable. It doesn't mess up your theme with unnecessary codes and has more advanced features like Merchandising rule for Search and Collection, Showing the matching variant image with filter selection or search term.
You could duplicate the live/original theme and set up the app into the copied one. This app fully supported almost Shopify themes and match with its layout.