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Dear Devs,
When changing the dpi in Developer Mode settings "Smallest Width." There are multiple things that happen when across the board Xperias with Nougate 7.0; including Xperia XA1, Xperia XA1 Ultra, Xperia XZ, Xperia XZ Premium, Xperia XZ1.
When changing 'smallest width' dp (dpi) between it's orginal number 423; i.e. 540-599 the 'action bar' buttons move out of place in landscape mode.
When set to 600 dp (dpi) or higher, is in tablet mode and the action bar moves to the bottom when rotated in landscape mode (avoiding the warping of the action bar). However another problem occurs; the file mangement system becomes locked. Gmail cannot attach a file, nor other apps cannot open it's file mangement system.

At first I tought this was a 'Write Access' problem, restarting and trouble shooting. I found out reverting the dp (dpi) to a lower density, the error pop-up disapears.
Please fix. How would Nougate 7.0 ever work on tablet? It's convient that changing the dpi settings is in Developer Mode instead of going the round about way pre Nougate without Root using 'adb and Command Promt.'