I would like to point out if you wants to change Screen settings globally (all users) then you can edit /etc/screenrc file. (Ubuntu). File path might be different on other distros.

In your case you can add the following lines to the file:

# define a bigger scrollback, default is 100 lines
defscrollback 1024

If you want to change screen settings globally (for all users) then you can edit /etc/screenrc (Ubuntu). File path might be different on other distros.

In your case add the following lines to the file:

# define a bigger scrollback, default is 100 lines
defscrollback 1024