Selector field, can barely add another class/selector after two classes defined (clickable area too small)

[mistersuuns (Robert Turner)]

Once I’ve added, for example, two classes in the Selector window, adding a third is nearly impossible because the clickable area is a tiny sliver on the right side of the last class:

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[Kevin_Mooney]

@mistersuuns

try clicking the symbol next to the classes: