TradeStation Help
You can enable a confirmation dialog box for when you delete a window from a workspace that asks if you want to permanently delete the window. By default, this setting is not enabled, therefore unless you enable the setting, you will not receive a confirmation message before you delete a window from a workspace.
            
 A check 
 mark in the Confirmations check box indicates that a confirmation message 
 will appear when deleting any window type. A green square displayed in 
 the check box indicates that, for one or more windows, the delete confirmation 
 message was displayed and you selected the 'Do not display this message 
 again for this type of window' option. Thus, the confirmation will 
 be displayed for some windows, but not for others. To reset the display 
 of the confirmation message, you can either clear the check box (disabling 
 the confirmation for all window types) or re-check the check box (enabling 
 the confirmation for all window types).