Not a shorts recommendation per se but good cycle top and sweat band. Yes, sweat band, very retro 70s look in my house.
Indoor riding is inherently hotter than real road cycling so the temptation is to go light on clothing. But when I’ve ridden without a sweat band and cycle jersey, the puddle on the floor is stunning. When using both items, they absorb a lot of the sweat that otherwise through the work of gravity would make its way to your shorts and the floor.
That and two fans going full blast.