Can Not resize windows on browser

When in Firefox browser I can not "down restore" the window. the "-" will work and the "X" will work but the double pane to reduce or restore the size of the window will not work

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Clarification Request
I've seen this when

Windows 10 is in Tablet Mode.

Also try the old Click+Drag on the title bar.

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It was in tablet mode. Turned off tablet mode and works fine. Thanks.

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Thanks for the update.

This often helps others avoid this common pitfall.

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