I see, it looks like the button got squeezed out on some displays. We could fix that by moving the DrumKit button to the MISC panel.

In the mean-time, you could delete the drum kit button (accessible via Window menu if needed)
bb\Data\Images\MainScreenButtons\PNL_VIEWS\SMALLVIEWSdrums_s1_m3_i208

Or if you are using a custom skin, delete the equivalent file from here:
\bb\Data\CustomSkins


Andrew
PG Music Inc.