Change conference quality

Hello everyone, I have a great mess, I currently have installed the latest stable version of jitsi (jitsi-meet_1.0.3548-1_all.deb 2019-02-14 10:49 2.7K) however, I have a big mess, because in my country connectivity (internet) is not very good, therefore, I need to configure jitsi so that from the beginning of a conference, it is initially in low quality or standard, at the beginning it starts in high quality and this is caused that constantly fall conferences, on the other hand this is another constant problem that I have detected when users enter through WIFI networks, the connection tends to be very unstable, for this reason I go to the community, so they can tell me if it is possible to set another quality as default. image.