Just upgraded to Ubuntu 25.10, and now in KDECONNECT-SMS, if I select one message to read then select a different message, a new “tab” or pane is spawned and pushes my Contacts list out of view:
… then I have to use the Navigation Arrows (above in RED) to get back to my contacts:
Once my contacts are back in view, if I select a different contact from this point, the message pane returns to a single messages view until I select another contact… Then it starts over! 
Not sure if the OS upgrade changed something, but has anyone else experienced this?