While working on images from Antarctica, I used the Clone Stamp and Healing Brush constantly, but found it distracting to see the sampling point icon each time I tapped with my pressure sensitive pen. While I realize this might otherwise be helpful, because I was constantly resetting the source point based on the contents of the image, I knew where the sample point would be and, as a result, wanted to hide it.
Command + H (Mac) | Control + H (Win) toggles the View > Extras feature to hide the sampling point icon.
Note, the first time you use this shortcut on the Mac, Photoshop will display a dialog asking “Would you like to use Command + H to hide Photoshop (Mac standard), or to hide/show selections, guides, etc. (Photoshop traditional)? Click “Hide Extras” unless you want to “Hide Photoshop” every time you use the shortcut. If you do choose to “Hide Photoshop”, you can change this behavior later by choosing Edit > Keyboard Shortcuts. Set the “Shortcuts For” to Application Menus and toggle the disclosure triangle for the View menu. Scroll down to Extras, change the Shortcut back to Command + H and click Accept and then OK.
Often when using the Clone Stamp tool, I would also unchecked the Show Overlay option in the Clone Stamp panel (this hides the preview of the source content in the brush preview). Holding Option + Shift (Mac) | Alt + Shift (Win) to temporarily display the overlay when you need to see it.