Help pls, Tool brush Missing thumbnail option

[sitchaij96069237]

hi guys,
my ps cc 2017 (no.2),
Tool brush missing all thumbnail option like picture (no1),how to fix it

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PS Version: 19.0 20170929.r.165 2017/09/29: 1138933  x64

thank you

[davescm]

Dave

Turn on brush tip and use the slider at the bottom to adjust the thumbnail size (to the left of the "2" in your second screenshot)

Dave