In addition to clicking X or Close in the window, you can press the Escape key for the following windows:
▪Additional Features
▪Execute Request and Request Editor
▪Open Estimate Events
▪Sharing
▪Create File For
▪Import Data From
▪Build Contract Databases
▪Find and Replace
▪Numbering Rules
▪Breakdown Selection
▪Breakdown Entire Estimate
▪Create Data Source
▪Users Profiles.