should i be worried?

hey there, I just noticed that whatever holds the base side from falling out of the wheel base (i have no idea what its called) has moved towards me and has created a gap between wheelbase and... that thing. I tried opening it with an allen key but i cant get it to open because i dont know which side to turn. I am afraid ill break something and thats why i thought i'll ask you guys. Should i move it back? and which way to i have to turn the allen key?

https://preview.redd.it/2zl4geg7je9e1.png?width=866&format=png&auto=webp&s=b630be8040d01d289cbc3eb941122dc4e72e40e7