You may be either using VNC or SSH to connect to the Pi. If that's the case, you won't be able to see the image pop-up, and you now have two options to fix that.
- Connecting the Pi to a monitor using HDMI
- Turning on Direct Capture Mode on RPi's VNC server.
For option 2, connect to your Pi via VNC, open the VNC Server dialog, navigate Menu > Options > Troubleshooting, and select Enable direct capture mode. Finally, reconnect the VNC connection.
OR, if you're on the Pi with an HDMI-connected monitor, check which desktop driver you're using from
Advanced Options ->
GL-driver. Then set the driver to G3 Legacy, if necessary.
Give us updates in the comments.