Several newbie questions

Hi,

I have a fresh jitsi meet server under ubuntu 18.04.4 LTS up to date no docker install but native apt install.
User authentification is made by LDAP
Many things work fine and I would thanks devs for the work…

But my questions :

My company organized a big meeting all was OK until the 75 person connect everyone was excluded from the vitual room. So is there’s a way to limit the number of participant ? I tried a parameter before when I was testing jitsi meet : “mod_muc_max_occupants.lua” but no chance… So I had to restart services, not very fun …
Is there a way to have a separate chat window ?
I try to configure live streeming but no chance, when I put the google key i have an Orange don’t start error window…
Regards