Can't see the line while drawing

Hello everyone !

Maybe this has been asked and awnsered sowhere else but I couldn’t find the right words for the search engine.
I can’t see the line while I am drawing with the brush tool. Just see it afterwards. The same with every tool : I only see the result after releasing the click, nothing while clicking.
I guess there’s a general awnser to that, and I would be so grateful if anyone could help me on this one !

Thanks !

Have a nice day !

Could anyone help me on this one ? That’s quite a disturbing problem to work with.