The Tools panel contains the tools available in the active Persona, and is presented vertically to the left of your workspace.
In Separated mode, the panel floats instead of being fixed to the left of the workspace. If it is placed within the bounds of the document window, the Tools panel will move when the document window is moved. If it is placed outside of the document window, it will remain in its fixed position until it is manually dragged elsewhere.
The panel can be customised to add or remove tools to suit your way of working.