I have no idea what the overall differences are between 1st gen and 2nd gen Echo Shows are. I just know they are currently behaving different. Your experience may vary from what I am describing but here it is anyway.
1st Gen Show
I like to hourly during daylight hours rotate several of my Wyze cameras up on the Show screen. Then I use the Custom action choice to fed the action. The Custom choice will only apply as the last action in the routine. It takes nearly a dozen routines between daylight and dark though the routines are only slightly different to get this to work. And I want to hear when the camera is changing, so I add a “send notification” action in the routine. In the routine, With the Send Notification action, we can select more than one Echo. I use one. But its a Dot, not the Show that’s showing the camera. I set the volume to 3, then Announce, which camera, then “show”. Looks like this.
Set volume to 3
Announce: Showing Street on Show8 (device choice is Echo dot, not Show8 )
Alexa, Show Street on Show8
Choose Device: Echo Dot (not Show8)
We know the Show action is used only in conjunction with a Show device.
Each of my cameras seems more likely to view successful, if I don’t use the Show to announce the voice and I don’t select the Show for the Choose Device at the bottom of the routine.
(That’s confusing to read. But I think makes more sense as you are setting up a routine.)
2nd Gen Show:
When I use a routine to direct “Show Street cam on Show8”, when the image (view) does not display in a Show8’s full screen. It comes up reduced or minimized into the upper left corner of the screen and its about 20% of the size of the screen. If I touch that small view, a temporary sub menu of choice appears. One is X to close it. Another is arrows hinting, open or enlarge. When I press the arrows, it expands the view to fill the screen. But I don’t want to do that each time.
I contacted the Echo team at Amazon (get this 3 times over two week time) each time to get a different tech. None understood what I was describing. I included pictures, but “we don’t have a camera to test with”, so I could not get help in ciphering how to stop this minimized view. Maybe its unique to Wyze cameras, don’t know. But they said, they had no vendor’s cameras to test what I was talking about. So, again, don’t know if its unique to Wyze.