# The User Interface [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [User Guide](Help%20System/GSTARCAD/2021/User%20Guide/(User%20Guide).md) [Toolbars and Menus](Toolbar%20and%20Menu--17f7120d0caa.md "Toolbars and Menus") The frequently used commands, settings and modes can be visited via the toolbar and the menu. [The Command Window](The%20Command%20Window--091c2ef0c1af.md "User Guide") The command window is a dockable and resizable window, where you can display commands, system variables, options, messages and prompts. [Design Center](DesignCenter--df1c7a575227.md "Design Center") In the Design Center, you can manage layer definitions, block references, xrefs and other contents like layouts and text styles. [Customize the Drawing Environment](Customize%20the%20Drawing%20Environment--6d1de7be0c18.md "Customize the Drawing Environment") You can customize the many elements of the working environment to fit your needs. [Tool Palettes](Tool%20Palettes--b8eab7ad2eb8.md "Tool Palettes") Tool palettes are tabbed areas within the Tool Palettes window and they can be used to organize, share and place blocks. --- ## Other versions with matching text [GstarCAD 2017](../../2017/User%20Guide/The%20User%20Interface--515776455324.md) · [GstarCAD 2018](../../2018/User%20Guide/The%20User%20Interface--515776455324.md) · [GstarCAD 2019](../../2019/User%20Guide/The%20User%20Interface--515776455324.md) · [GstarCAD 2020](../../2020/User%20Guide/The%20User%20Interface--515776455324.md)