Hi kjell.ek,

Please open file  "\richtexteditor\scripts\config.js", find section below

inserttemplate_removestylelist:  "font-family,line-height,text-decoration,text-align,text-underline,letter-spacing,line-height,padding,border,margin",

Change it to

inserttemplate_removestylelist:  "none", 

Regards,

Ken