I dont know if this will work for you, but it could be because of corrupted files
before doing this try reinstalling roblox studio though
Go to finder, Library/Roblox and open the latest folder(it’ll have some long name)
Then spot (GlobalSettings_13.xml) and (ClientSettings) and delete them, these files contain studio setting which could be malfunctioning
Restart Roblox studio
Let me know if it works