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Fast CAD drawing is an essential skill for designers in various industries. However, in the process of using CAD, people often encounter many tricky problems that cannot be resolved smoothly. Today, I’d like to share with you some common CAD troubleshooting tips – please embrace this wealth of useful CAD knowledge! 1. How to quickly switch workspaces: Taking HaoChen CAD 2020 as an example, it offers a traditional interface as well as a 2D sketch interface. Engineers with many years of experience generally prefer the traditional interface, featuring a drop-down toolbar that is simple to use. Beginners or young engineers may prefer the 2D sketch mode, as it is intuitive and easy to use. 2. Ctrl+number – Master the operation interface: Ctrl+0: Switch between full-screen modes freely ； Ctrl+1: Switch to properties dialog box ； Ctrl+2: Switch to Design Center ； Ctrl+3: Switch tool palette ； Ctrl+4: Toggle the Sheet Set Manager on or off ； Ctrl+8: Quick calculator ； Ctrl+9: Toggle the command line. 3. Why are the auxiliary commands displayed as icons rather than text? Right-click on the auxiliary command icon, and in the menu that appears, uncheck the box next to \"Use Icon\". 4. If the graphics on the interface suddenly stop moving, you can enter ‘rea’ plus a space in the command line, or in normal mode, go to the View menu and select Regenerate All. 5. What to do if CAD commands or settings have been modified? Enter OP (options) in the command line; in the options dialog box, locate Configuration, reset it, and then click OK. 6. What to do if an error occurs or the program crashes when trying to open an old drawing? You can create a new CAD file and insert the old drawing as a reference block into the new CAD file. 7. How to prevent CAD from creating BAK files? By default, HaoChen CAD creates backup files (*.bak) whenever it is saved; this is a safety feature in CAD designed to prevent damage to the graphic files in case of errors that occur during software operations or saving. But it ends up creating a bunch of BAK files that take up space, which is unnecessary; CAD can be set not to generate BAK files, and the method is very simple. In the “Open and Save” tab of the “Options” dialog box, uncheck “Create a backup copy each time it is saved”, as shown in the figure below. Enter ISAVEBAK in the command line, press Enter, then enter 0 and press Enter; that will also work. 8. Want to restore an object that was just deleted, but not undo other operations? CAD provides a dedicated recovery command for deleting objects; this command is called OOPS. It’s likely that many people have never used this command. Have you remembered these CAD tips? Don’t forget to bookmark it; practice regularly. I hope this CAD FAQ guide can be helpful to all of you!