I want to make a 2D game with a long-legged cartoon character. I would like that:
when you press the space or shift keys, his legs disappear and he falls (crouch),
and when you release the key after one second or two, his legs appear and he jumps.
how do we do that with the blueprint widget please?
In the character blueprint you can use this:
Add key events, get the leg mesh for the character, then set the character to crouch.
On release wait two seconds and reset everything again.
You can change the crouch settings if you select the Character Movement section:
Now you can change the crouch settings in the Details Panel
Here is a full-screen image:
If this helped, please mark my answer as solution. Thank you and good luck! 
