How do I prevent components in a Simulink custom library submodel from being indexed for quick insert?

When creating a library with submodel blocks, they all expand to sublibraries by default as I understand. So all components inside, even standard blocks, are beeing added as entites to pick. This quickly clutters the quick insert context menu if I dubbel-click in a model and also the library browser.

I have found this related very old answer

https://se.mathworks.com/matlabcentral/answers/101698-how-do-i-add-custom-libraries-as-a-tree-structure-without-spilling-its-contents-and-how-do-i-add-des#answer_111046

Is that answer still valid? Do we still have to mask submodels or creating scripts to avoid this?

Feels like work-arounds for something that should be easier. Maybe there is a simpler way nowadays? Like a checkbox to tick somewhere.

Note that I am not looking for a way to prevent inspection of the submodels, just to prevent their contents from beeing indexed and expanded in the library broswer and quick inster menus.

[Matt]

Hi Markus,

I was looking for the same thing but I could not find anything from MathWorks Documentation. There is no check-box to restrict the custom library contents to spill over.

The workaround provided in the answer is still valid.

Regards,

Matt.