It's linked to in layout properties so you can generally easily access it from a layout view. However we could always try to make it more visible. Where else do you think it could be exposed?
BTW this is a good example of something that a CSS theme cannot change - it needs logic added to the application itself.
i think the entire structure of the c3 interface should be really different from c2 and thats why just "moving" that option to another panel wouldnt solve the problem, it needs a new ui structure, things like not being able to work with multiple monitors or that event sheets takes horizontal space instead of vertical like real code and the shape of the events are really huge and take a lot of space, look to any adobe software or apple and compare it to construct interface and you can see its pretty old.
yeah we can drag all the boxes to any side of the screen like in Construct2 but they will be Incomfortable to use, try to snapping ANY box to the top or down sides of the UI, they will look like they dont belong there.
i asked about changing the ui before for C3 and thom said that with the CSS we could do more than just a color change of the themes :/