Froggy, the popup config is client game config, doesn't get affected by server settings.
For a default popup messages on left side, check your config has the following cvars:
cg_popupFilter 0
cg_popupStayTime 2000
cg_popupTime 0
cg_popupFadeTime 2500
If you get them working with these settings, you can tweak how fast they dissapear decreasing stayTime and increasing fadeTime.
Popup filter lets you show less info: https://etlegacy.readthedocs.io/en/latest/cvars.html#cg-popupfilter