Sculpt mode - What is the functionality of those 'F's in the Brush tools panel?

The same with the Stroke Panel…

Thank you so much



They give the data block a Fake user so it does not get deleted when you close blender

They’re fake users, they’ll be found in materials, particles and probably a few other spots.

It’s significance is that many objects sharing identical settings can be affected at once. The number represents how many items are affected.

When blender is closed items without associations are cleared. A fake user enters the equation giving the software a prompt to retain the item, in this case a brush.

Right. Cheers guys.