When you are syncing audio is a must This video kind of explain how to fix it but they are still very small: https://www.youtube.com/watch?v=UKslOkep9g0 They should use 100% of the space for audio only tracks and most likely at least half on videos or being able to toggle it with video (If the problem is that hides the pictures) I think the new timeline will separate automatically video and audio, so more reason to make it bigger :)
In the refactoring version you can adjust the height of each track separately. But it would be a good idea to set the default height in settings for video and audio track separately.
In the last release a new feature was added to normalize audio thumbnails, you can access it by right clicking on the audio track and choose it. (Also you can adjust the track heights...) Hope that works for you. Let us know if it doesn't.
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!