I recommend introducing a function that would allow users to rearrange the order of objects within the widgets in the sidebar/navigation menu.
One way this could potentially be implemented is through a drag and drop interface within each widget. Users could click and hold on an object, then drag it to their desired position in the list. Alternatively, (which I don’t prefer) up and down arrows next to each object could allow users to move them higher or lower in the widget list.
There are some objects (pages, notes, sets, etc.) that I use more frequently and I would prefer to have them at the top of my widget category. For example, in my AnyType, I use “All Characters” more often than “Picrews Collection,” so it would be much more convenient for me to have “All Characters” at the top and then arrange the rest based on most used to least used. Here is an image that illustrates my current situation: