Where's the "hold" sign in the new Muse Score

I'm adjusting (slowly; I'm kind of not a fan of "progress", and what I'm doing isn't sophisticated enough to require all the wonderful new features) to the new version of MuseScore, but I can't find the "hold" sign anywhere I expect it to be (looks like a bird's eye). It used to be in the "Articulations" menu, but it isn't, any more. Can anyone tell me where it is?

Also, how do I make a double whole note, besides by using a tie mark?

Thanks,

Beth HIlgartner