Having Problem In URL Of My Site

[AkbarHashmi]

Hy EveryOne!
I'm running an e-commerce online shopping website, (let suppose https://abc.com)
firstly URL of my category pages are as follow:
https://abc.com/collections/mens-section/footwear-for-men/shoes-mens-section/running-shoes/
https://abc.com/collections/mens-section/mens-grooming/mens-watches/
or ETC,
these URL's are not looking User-friendly and google friendly!
so that, I have changed all the permalinks of my category pages with the help of a plugin as follow:
https://abc.com/running-shoes/
https://abc.com/mens-watches/
that's looks great!
but now I'm facing a very serious problem.
after changing URL's, I have submitted a new sitemap to google search console, but the problem is that new URL's are indexed in google search engine and at the same time old URL's are not de-indexed from google search engine.
it means:
https://abc.com/collections/mens-section/mens-grooming/mens-watches/
https://abc.com/mens-watches/
both are indexed in google and at a specific keyword of these URL like "men watches"
nothing URL of my website is shown!
any senior here, who can help me on this problem?
Thanks!