Kdenlive/Manual/View Menu/Save Layout As
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View>Save Layout As
Kdenlive allows a great deal of freedom to customize screen layout. You can choose which windows to display and where to position them. You can resize them or undock them and move them to a second monitor. Any changes you make to the layout will be automatically saved so that the next time you start Kdenlive, things will look as you left them. This is fine if you have one layout that works for all your projects. However, you may want to have different layouts for different types of projects and be able to switch between them as needed.
Kdenlive lets you name and save up to four custom layouts. In the example shown, no custom layouts have been saved yet so they are just labeled 1 through 4. Click and then choose one of the four choices presented.
The Save Layout dialog appears and you can give your custom layout a name.
Now you can easily switch to that layout whenever you'd like by choosing the corresponding Load Layout menu selection.