If Express Tools are missing from the Ribbon in AutoCAD, you might have to install them or just load them to CUI.
To add express tools in AutoCAD,go to Control Panel in your computer and look for “program and features” then click on AutoCAD version. Window for AutoCAD will have three options in it as shown in following image. Select “Add or Remove features”
Check “Express Tools” from the feature list and hit update.
If there is already a check in front of Express Tools,that means it’s there in AutoCAD but just not loaded in interface. Go to AutoCAD and type command CUILOAD then click on load and go to following folder and look for file name acetmain.cuix. If you have more than one type of AutoCAD of same version, you can look in different AutoCAD folders until you find it.
C:\Users\yourname\AppData\Roaming\Autodesk\AutoCAD xxxx\ Rxx.x\enu\Support\acetmain.cuix
Load and Express Tools should be in the list now, click Close.
Express Tools are now displayed in Ribbon;
Sometimes, you might have to restart AutoCAD to see the changes.