Function getMainPanelWidthInRem

getMainPanelWidthInRem(): string
JMap.Application.UI.SidePanel.getMainPanelWidthInRem

Returns the width of the main panel (side panel width minus menu width) in rem.

Returns string
Example
```
// returns "24.375rem"
JMap.Application.UI.SidePanel.getMainPanelWidthInRem()
```