@operakurausu Same sympthoms, same problem. The sidebar is OK in maptop monitor. It becomes half-sized when I move Opera to external monotor. Opera 107.0.5045.15, MacBook Pro.

Worked out-of-the-box in my Opera 89.0. In addition, this extension supports "application/vnd.spring-boot.actuator.v3+json" responses correctly and that's what I needed.

It sovled this problem in my Opera. Thanks!