Linewights do not display on screen in the drawing? Please check the LWDISPLAY system variable.
The LWDISPLAY system variable is used to control whether the lineweights of objects are displayed.
Enter LWDISPLAY, then press Enter key,
Then we’re prompted to enter new value for LWDISPLAY, the initial value is Off, which doesn’t display lineweights, we can enter On and press Enter key to enable the display of lineweight.
Please note that users can input 1 and 0 in place of On and Off to change the setting.
Alternatively, we can turn off/on the display of lineweight via the Line Weight in the Status Bar, which is located at the bottom,