Access to SharePoint online layout

[Soheilsd]

I want to add a font family to my SharePoint online theme but don't have access to sites layout. 

Anybody knows what should I do??!!

[#2]

Assuming you are talking about modern SPO sites, unfortunately you cannot do this

[#3]

@Juan Carlos González Martín  yes Modern SPO sites...

I am afraid so...Microsoft should provide these simple accesses.

thanks

[#4]

@Soheilsd even though it's a simple technical solution to add a font, supporting and allowing override of the used font could have impacts on icons and accessibility. I try to think of Office 365 and SPO as more canned products like Word/Excel. You can customize with add-ins, menues etc, but the product will look like itself.

Then we can all agree if this is good or not :)