We need more information to help you. Is this a new computer? Did you recently upgrade your OS? What troubleshooting have you tried so far? Did you try resetting your preferences? Did you try uninstalling and reinstalling Photoshop? Please provide as much information and videos or photos amid you can.
Try resetting the preferences. To restore preferences quickly using a keyboard shortcut:
Press and hold Alt+Control+Shift (Windows) or Option+Command+Shift (Mac OS) as you start Photoshop. You are prompted to delete the current settings. The new preferences files are created the next time you start Photoshop. Note: Using the keyboard shortcut, preference files for custom shortcuts, workspaces, and color settings will also be reset to default.