I have the same issue with an SM-T510 "Tab A 10.1 (2019)" tablet. It's like the touches get scaled by the opposite width/height. Touching the control box upper left is fine. Touched it lower left puts the cursor on the left edge but only about 66% down from the top. Can't reach the bottom of the screen! In the horizontal direction, if you touch about 66% across, the tablet gets a touch at the right edge. Touch any further across and you're touching off the edge of the screen. (You can turn on "Pointer Location" in Developer Mode.) Worse on the tablet - if you start the connection when the tablet is horizontal, the control screen is totally black. If you start the connection when the tablet is vertical, you can see the screen. Either way - blind or not - the touch mapping when the tablet is horizontal is broken.
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Noticed a similar thing on my SM-T510 but worked out some interesting things. If my tablet is vertical, I can connect, see the screen and can control it properly. If I rotate it to horizontal, I can see the screen but clicks are in the wrong place. I confirmed this by turning on "Show taps" and "Pointer lcoation" in Developer Mode. ("Show Taps" is probably not necessary.) If I rotate back to vertical, everything works again. On the other hand, if the tablet is horizontal when I start the TeamViewer connection, I get a black screen. The screen stays black even when I rotate back to veritical. Taps in horizontal mode do not land where you'd expect similar to as described above when I can see the screen because I started the connection when the tablet was vertical. It's like the cursor position on the tablet is being scaled improperly in both directions from the controller side. If upper left corner is 0,0, Clicked have-way down the client, puts the cursor 32% down the left edge of the tablet. Clicked in the bottom left of the contoller puts the cursor 63% down from the top on the tablet. Clicking halfway across the controller puts the cursor 77% across the tablet. Clicking the controller 62% across puts the cursor at the rigth edge fo the tablet. Rotating the table back to veritical, the clicks end up exactly where you'd expect even though the screen is still black. (I do not have any of these problems with an SM-P610, btw.)
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