By default, the platform does not have this option. You can use the following CSS code.
Please follow the steps below:
1. Go to BuddyBoss > Theme Options
2. Under Custom Codes, enable CSS
3. Append the following:
@media only screen and (max-width: 600px) {
.members div#primary {
order: 2;
}
.members div#secondary {
order: 1 !important;
}
}
4. Save changes.
Screenshots
Without code
With code