Hi Tobias,
Greetings from Syncfusion support.
We have considered the issue "Splitter resize not
working properly" as a bug from our end, and the fix for the issue
will be included with our upcoming Vol 1, 2022 SP release, which is scheduled
to roll out in the middle of May, 2022.
You can now track the current status of the report, review
the proposed resolution timeline, and contact us for any further inquiries
through this link:
https://www.syncfusion.com/feedback/34717/splitter-resize-not-working-properly
Until then, we suggest using Syncfusion. Blazor
Layouts nuget package, version 20.1.0.51.
Regards,
Buvana S