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Description
ticket 1053667
The Splitter panes always have their dimensions set in absolute units (pixels). Initially, it may look like the sizes are applied in percent, but internally they still work in pixels. After a Splitter pane is resized, the assumption is that the user wants the size to be exactly as specified, so the panes no longer resize proportionately. This behavior is by design.
A possible option is to use custom logic and resize the Splitter panes on browser window resize, so that all of them remain visible. Here is a similar scenario implemented for widths, instead of heights - please tweak it according to your preferences.
https://docs.telerik.com/kendo-ui/knowledge-base/keep-pane-size-in-percentages