In step 1, we will make an empty crosshair widget named MyFirstCrosshair to put some crosshair layers on it later.
Decide a folder to put a new crosshair. As an example, we created MyCrosshairs folder under Content.
Then, find the empty crosshair widget blueprint provided by Crosshair Assembler at CrosshairAssembler/CrosshairSamples/WB_Empty_Crosshair and copy it by Ctrl+C.
Go to the MyCrosshairs folder and paste the empty crosshair.
Then, rename it to MyFirstCrosshair.