Either use Change Properties (Button in the left toolbars), or use change like draw tool. For the former, if the entity has an outline, make sure you only select the entity, and not the outline, and for the latter, this is only applicable if there is already a drawing tool defined with the fill style you want (Otherwise use change properties)
If you don't want to see all the non-bitmap fill styles in the dropdown in the dialog, you can use the Fill Style Combo Mask to configure what's in the list
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Thanks!