Please read this (in particular the section titled "Supply pertinent information for more timely and effective answers”): https://community.adobe.com/t5/using-the-community/community-how-to-guide-tips-amp-best-practices/td-p/11601738?page=1
Could you please post screenshots taken at View > 100% with the pertinent Panels (Toolbar, Layers, Brush Settings, Options Bar, …) visible?
... View more