Weird thing happening with mesh parts?

Hi

So I'm working on a project right now, and this portion of my build uses quite a few meshparts. Everything was going smooth at first, but just recently I found that every mesh part in the game has a weird outline bordering (or highlighting) the mesh. This can be seen here:

https://imgur.com/gallery/myL5wNm

This doesn't show up in-game, of course, but it still is very distracting and I would like to be rid of it. I checked my Studio settings and everything and couldn't find anything that might have enabled these outlines to appear, unless I overlooked something. I've been doing ROBLOX Studio for a while now and have never seen this happen, but then again I only recently started in with meshes. If anyone knows how to remove these, some insight would be appreciated.