hidden block "main menu" in front page is visible in moodle mobile app

I have a block "main menu" on the frontpage. some files are added to this block in order to set links to these files from other pages in moodle. the files should be invisible on the front page, so I hide the block.

In the moodle mobile app the block and its content is shown, in a "normal" browser theblock is hidden.

How can I make the block invisible in moodle mobile app?

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Just found a workarround. Each acitiviy or material can be set to stealth mode. Sorry for the trackerissue.