You need to adjust all GameUserSettings.ini (gus.ini) files of all grid servers. The gus.ini file is usually, depending on Grid Server subfolder (in this case A1), located at
Windows:
..\ShooterGame\Saved\A1\Config\WindowsServer\

Important:
You need to put this stuff into your gus.ini of all servers of your grid,
do not put it into your game.ini!

Main tag to put above, but only once

Those are default values, if you do not change them leave the option out of your gus.ini

Explanation of options:
Represents the time in seconds until the system will automatically remove a player character, if the corresponding player didn't login for that amount of seconds; -1.0 disables character spoiling completely; Values do clamp between 1 day (86400 seconds) and 30 days (2592000 seconds);

Setting this to true will get rid of the grid travel warnings, but it will also remove all functionallity that depends on it. For example Duplicate Character cleanup, Grid Chat, and Grid Destroy Actor commands.

States time in seconds until grid travel warning message should disappear, in case of system failure - when the travel should normally be good; Default setting are 30 minutes (1800 seconds)

If set to true this option will disable the second chat box for cross grid chat completely

If set to true, it will only allow cross gird chat modes: whisper, corp, alliance

Determines the amount of iterations of ships, crew and creatures until a delay step of 0.01 will be taken. This means that on default it does take 500 iterations with 0.00 delay/no delay and then one step with 0.01 seconds.

Setting this to true disables the NPCDuplicate check completely.

Used for the admin API Log tab. Higher levels increase the log verbosity. Max Level is 5