Select the display representation where you want to remove window muntins, and click .
Click the Muntins tab.
Select the muntins block to remove.
Click Remove.
Repeat steps 7 and 8 to remove multiple muntins blocks.
Select Automatically Apply to Other Display Representations and Object Overrides to apply the changes to all display representations of the selected window style.
Clear this setting to apply the changes to only the selected display representation.
When you finish removing muntins blocks from the window style, click OK twice.