Why is ít not possible to move "Approvals" action group to the top of the Actions list ?
This behaviour is by design. However, thank you for the suggestion, we will consider it.
It is pretty annoying for the user, that this information in not immediate accessible.
A user can access Approval Requests for which they are listed as approver by clicking the button next to their username in the top right corner.
Also, Approval Requests initiated by the user and for which they are listed as approver are accessible from My Menu.