Question / Help Source Selection?

i just moved over to obs studio after losing kapchat support in classic. in classic, to select/un-select a source you simply "ticked/un-ticked" the box. there is no option to do this in studio that i can see. only an "eye" icon to the left of the source name. it seems problematic if the only option is to adjust their position in their order - am i missing something? thanks for your help.
 
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