This feature must be in Studio One like it is in Pro tools. When you select a clip/event, it activates looping. There also must be a function that activates looping in that case like : press "L"=loop on/off then in that "on" mode .
When you select a clip, it activates looping automatically. When you're "off" it does nothing to it...
Simple as that. That feature dont seems to be there. i believe it should/must be there.