Currently, it is not possible to define a static pane in the Splitter with a fixed size that does not change when interacting with the surrounding panes, unless it is configured as non-resizable. In turn, configuring a pane as non-resizable affects the resizing ability of the surrounding panes as well, which means that they also become non-resizable.

It would be great if the Splitter could provide the ability to configure a static pane with a fixed size that is not affected by other functionalities like resizing, and in turn, have the possibility to resize the surrounding panes of a non-resizable pane.