How to add plugins for Extensions Settings Synchronization on adding website

When adding a new website, there is an part for Extensions Settings Synchronization, where I can select plugins for installation. On my dashboard I see only three plugins (PageSpeed, ProReports and UpdraftPlus). How can I add more plugins in this section? I went through the settings and found no option for that. Would help me save time when adding new sites.
Thanks in advance
Alex