Finally I found this post! I had to type this into google to find this: "inventor sketch type number box too small dimension input can't see" Most of the posts were unrelated things.
Anyways, I've seen this a few times in the past with my coworkers. Not sure of the cause or the solution... But I'll give some ideas just in case it may help. (And yes I don't think people post about this b/c they can't find out how to use delay screen captures.)
My current coworker just had a an issue with his keyboard holding down a button or buttons on his keyboard causing hotkeys to be pressed or something. He started a new drawing and everything he pressed caused his Inventor to change all his settings. So I'm pretty sure it's a setting somewhere. But we can't figure it out. As another possible solution: In other modeling programs, you could force the visual display size of this item in a .ini file hidden in the depths a deep dark obscure folder that no one could normally find... I'm just not sure if Inventor has anything like this?
Another possible solution is to close everything, add a monitor and make it your main display and see if it changes...
If that doesn't work, select the program on your desktop, try the right click, properties, compatibility, DPI settings... (same trick for Vault)... I think this was a solution once but I'm a bit foggy due to those coworkers not being around anymore.
Inventor: Model States is not a replacement for iParts / iAssemblies. It does not have all the same features yet and does not communicate well with our large currently in use libraries. 😞 https://forums.autodesk.com/t5/inventor-ideas/model-state-support-tabulated-parts-list/idc-p/11360616