I simply don’t understand what screws that is. Have 1mm level difference on Y-axis. Glass bed.
The 2 black plastic thumbwheels on each corner of the bedframe.
To raise the bed:
Turn the lower wheel clockwise, than the upperwheel clockwise till it’s fasten.
To lower the bed:
Turn the upper wheel anti-clockwise, than the lower wheel anti-clockwise till it’s fasten.