Why there are not available options Аdobe brushes in illustrator?

Why when you create a new brush the "art brush" blocked the following fields in Adobe illustrator?
March 23rd 20 at 19:27
1 answer
March 23rd 20 at 19:29
Because either you're using a mouse, not a graphics tablet, or with your tablet something wrong (driver settings, customize in Illustrator). The mouse, obviously, to the pressure force and the tilt insensitive.

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