More information required.
From your screenshot, the active layer is maincircle and the active tool is bucket fill.
Are you aiming to move the active layer (maincircle) up or down the layer stack and Layer -> Stack -> Raise /Lower layer (or alternatives up/down arrows / click-n-drag) do not work (1) ?
or
Are you trying to move the layer maincircle relative to the other layers ? In that case the layer lock is on (2) toggle it off and use the Move tool.
From your screenshot, the active layer is maincircle and the active tool is bucket fill.
Are you aiming to move the active layer (maincircle) up or down the layer stack and Layer -> Stack -> Raise /Lower layer (or alternatives up/down arrows / click-n-drag) do not work (1) ?
or
Are you trying to move the layer maincircle relative to the other layers ? In that case the layer lock is on (2) toggle it off and use the Move tool.