There are browser extensions that block shorts. You can also block all algorithmic suggestions. I uninstalled the YouTube app ages ago and wish I'd done it sooner.

How feasible is YouTube Kids? Honest question.

I have set up YT Kids account for a young relative and manually approved many channels and hundreds of videos. This is one way you can block Shorts, with the added benefit it’s no longer an infinite feed.

NewPipe and Tubular also lack the continuous video feed feature, so you can watch Shorts if someone sends you a link, but they're just like regular videos.