Hey guys just thought I add insight on a problem I see some are having with removing the kasa app from smartthings. Just follow these steps and you will be set. My advice is DONT RE-LINK THE KASA APP TO SMARTTHINGS UNTIL YOU HAVE ALL YOUR DEVICE ADDED TO YOUR TP-LINK KASA ACCOUNT FIRST!.. or else none of your device will not show in smartthings.
Step 1: go to the menu tab(located on the top left corner) in the home page of smartthings
Step 2: Go and tap the settings(gear icon) at the top right corner.
Step 3: select “Connect Services” (3rd selection down)
Step 4: Select the “TP-Link Kasa” app.
Last Step: Select “Delete Account” at the bottom.
That’s it!.. your TP Link kasa account is now unlinked from smartthings. Like I mentioned earlier, do not re-link this account until all of your devices are installed and added to you TP-Link kasa account first! You can always add more tp link devices to smartthings, but you gonna have to do these steps all over again in order to sync you devices to smartthings. HOPE THIS HELPS, LATER!