Control the width of the navigation pane for tablet output

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Hi all,
I'm editing a HTML5 tripane skin in Flare 2017 r3. I know how to control the width of the navigation panel for Web output (i.e. on the skin's Setup tab) but I can't find a similar setting for Tablet view.

When I view my output in a browser, resize the screen so the output behaves responsively (hamburger icon appears) and click the icon, the navigation panel is way too wide.

Does anyone know how to control the width of the navigation panel for tablet output?

HTML5-tripane-skin-editor.png

tablet view-tripane-skin.png

[NorthEast]

I posted an answer to that in this thread:
viewtopic.php?f=9&t=19086#p100069

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Thanks, Dave. I missed that post when searching for a solution. I've followed your steps and the navigation panel width is now under control. Fantastic solution, much appreciated!