If you have several similar custom elements, you can consider packing them as a library. You can click the button in the "Custom Elements" category, and select the "Add Library..." item to add a new library.
You will be asked to input the new library name:
After you click "OK" the library is created. The libraries are folders actually, the figure below shows the directory structure that store the libraries and elements:
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To move custom element to library, just move mouse cursor over the custom element, and click the button over the element. You can then select the target library in the drop-down list.
You can switch the current library in the "Custom Elements" category. Only the elements in current elements will be displayed.
Remarks: all elements (no matter where they are placed) belongs to the "All" library.