Scrollable box for indicator selection

[ryantibs]

On the dashboard builder page, can we make the box for the indicator selection scrollable?

Currently it just hides more than a fixed set of results, so if you don't really know what you're looking for and type in a generic term (like "covid") then you have no way of manually browsing everything.

p.s. I actually find it very hard to actually find the indicators I'm looking for here anyway, so I'm open to brainstorm ideas about how we might make that easier.