What are these squares? -- CAN NOT ERASE!

[untalmau]

Hi, I have this issue.
Sometimes these boxes appear when the screen is empty and the mouse moves over the screen, what are they? and what are they for? how can i remove them?
(picture attached)
thanks for any help
.

[HarryBee]

Hi,

it’s the so called 2.5D canvas
Here is a video that explains it much more as I can do it with 1000 words:

2.5D Canvas in ZBrush, what is it and how does it work?

[untalmau]

thanks a lot !!!
bless