How to collapse a subsystem in Simulink

Once I create a Subsystem in Simulink, I can expand it. But once expanded, I cannot collapse it again. Please let me know how to do this.

[Fangjun Jiang]

Please specify what is "expand" and "collapse".

[Ani R]

Please see the below screenshots. First screenshot shows the collapsed subsystem. Second screenshot has the same subsystem expanded. Once I expand the subsystem, I cannot find any option to revert it back to the collapsed state.

[Fangjun Jiang]

Use Model Browser. It is like a file/folder hierarchy for model, you can click anywhere to view it.

[Ani R]

Thanks.

Answer 1

[Jon]

Just go back up one level to the parent

[Ani R]

That's not exactly what I meant. Please see my reply to Fangjun Jiang.

[Jon]

I assume that to expand the subsystem you did something like.

1. Right click on subsystem
2. Select Subsystem and Model Reference
3. Select Expand Subsystem

Then to collapse it again:

1. Right click on the expanded subsystem
2. Select Create Subsystem from Area

[Ani R]

I thought that might create a second subsystem.

Thanks. I will follow your instructions.

[Jon]

I was reading up a little more on expanding subsytems, please see https://www.mathworks.com/help/simulink/ug/expand-subsystem-contents.html#:~:text=To%20interactively%20expand%20a%20subsystem,a%20subsystem%2C%20use%20the%20Simulink.

After reading this, I see that expanding a subsystem is useful if you really want to flatten (reduce the levels of heirarchy) in your model, but it is not just a means to view what is inside of the subsystem. It really makes changes to how your model is wired, eliminating ports and other details.

If you just want to see what is in the subsystem and not change anything then just double click on the subsystem and a window will open showing you the details of what is inside the subsystem. Then when you want to go back just click the upper arrow (shown in my first post).

[Ani R]

Understood. Thanks.

[Jon]

Hi, if this answered your question please accept the answer. That will take it off of the list of unanswered questions, and also will let others with a similar question know that an answer is already available.