For short group games, some of our favorites are:

• Codenames (~15min)
• The Resistance: Avalon (similar to Secret Hitler; ~30min, unless you’re really argumentative)
• Love Letter (~20min)
• More recently, Captain Sonar (45-60min).

And honestly, we’ve had a surprising amount of fun with Liar’s Dice too (a.k.a. Bluff/Perudo/Dudo; 15-30min)