On the mobile app you can tap the Instagram logo and there's an option to show only posts from your follows. It's not sticky, unfortunately.

Also if you're on android I recommend:

distractionfreeapps.com/

They make a bootleg version of the app with the ability to remove certain feeds, e.g. reels, discover, stories

It's sticky on the web though:

https://www.instagram.com/?variant=following