Indeed, it's for mass editing in region with a lot of streets without any city name and street name.
I would like to select everything to put the city name.

I'm busy in the region of Andenne, but I already made a lot of streets.
for exemple such a region:
https://www.waze.com/fr/editor/?lon=5.1 ... ,240533762

For Info,

I've already made the changes for the city in this section

There is the exemple of an American who mass edited, and he managed to erase all data from streets of an entire state

he needed help of an entire team to recover his mistake as fast as possible, and his 'little misclick' is a fameus exemple

I don't dare

by the way, if you select a segment with a streetname, and you multiselect other segments with other or no streetnames,... and than you correct 'all citynames'... than all streetnames become the same or 'none' - I noticed it in small amount of multiselecting, I really don't wanna do that with an entire screen

You can also press "m" before you want to select several segments. "m" is an official shortcut to select more than 1 segment and you don't have to press "CTRL" all the time

But always be aware with mass editing! You can do much harm, so be sure with what you do!

I also wouldn't recommend. Because you need to be sure what cityname you'll have to fill in! With mass editing this quality is far from garantueed! As Steven also said: most of the time is one letter enough to select the cityname.

Why would you want to do that? You're talking about mass editing, which is a very dangerous thing...

I would not advice you to do that... it's only a little effort to input the cityname, when also inputting the streetname... only typing the first letter is mostly enough to get a autosuggestion...

If you want, i can see what i can do, but then you have to tell me what area you're looking at...

annickdw wrote: by the way, if you select a segment with a streetname, and you multiselect other segments with other or no streetnames,... and than you correct 'all citynames'... than all streetnames become the same or 'none' - I noticed it in small amount of multiselecting, I really don't wanna do that with an entire screen

Been there, done that
Luckily it was only a rather small area so correcting it back to the original situation didn't require a whole night