I Think this should be work standalone: Got to Samsung Dex Settings and click "about Samsung DeX". Click the Samsung DeX Logo 5 Times, now you should be in developer mode. Now Activate the Developer Mode on your Phone (About Phone --> Softwareinformation ---> Click on the Buildinformation for Eight times). Now Go To the Developer Settings (At the Bottom of Settings) and Scroll to the Bottom. Now Enable "Force activities to be re-sizeable". At least clear your recent Apps and restart your Phone.
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