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You can remove any of the fields or local menu option icons by right-clicking anywhere on the Inspector Bar (except the numeric fields). This opens a local menu in which you can deselect customize dialogue which lets you add or delete any of the controls. You can select icon from inspector bar and drag it away to exclude from inspector bar and you can add commands by searching them in commands tab and selecting it and draging into the inspector bar. You can also change the width of any of the numeric fields by dragging either side with the mouse.