Configurable Workspace: hide contextual sidebar by default in record page does not work.DescriptionConfigurable Workspace: hide contextual sidebar by default in record page does not work.Steps to Reproduce - Hop onto Utah or Tokyo instance.- Go to UI Builder. Create a new experience and make sure it has record page with contextual sidebar.- Go to Config tab of contextual sidebar view port.- Enable 'Initially Collapsed' toggle. As per the documentation, this option is to hide the contextual sidebar by default. A user can open the sidebar by selecting a tab. To enable this option, you must first select to make the sidebar collapsible.- Go to configurable workspace and load the record page. Notice that Contextual sidebar does not get collapsed as expected after the initial page load and gets occupied with empty space.WorkaroundThis is Working as Expected. sidebar's initially collapsed property and resizable panes' defaultDividerPosition property need to be managed together. Only customizing the sidebar initially would result in inconsistent behavior.Related Problem: PRB1666041