How to unhide look under mask arrow in matlab simulink ?

I am using matlab 2018b. I created my library but I didn't find that down arrow.

Answer 1

[Pruthvi Muppavarapu]

The “Look under badge” does not appear if the library is locked, or its "LockLinksToLibrary" property is set to 'On'. Try unlocking your library and the look under mask arrow might appear.

[JAMES MAINA]

How do I unlock the library so that to look under mask.Help please

[Pruthvi Muppavarapu]

You can manually unlock your library by opening it and in the bottom left corner there will be a lock icon. Try unlocking the library by clicking on the icon and this might make the "look under mask: badge visible.

[JAMES MAINA]

Thanks

Answer 2

[sneka vi]

There is an unsupported block parameter called 'MaskHideContents' that can have the values 'on' and 'off'.

So to hide the implementation for the currently selected masked block you execute:

>> set_param(gcb,'MaskHideContents','on')

Hope this helps