hi @edumerco 馃槉 the logic to configure the left sidebar is already in place, and we use it for customize the sidebar based on which extension are enabled (now it's not that obvious because this instance has not many extensions enabled, but you can see that recently it was added a "publication" link at the bottom of the sidebar, because we enabled the open_science extension ) .
We do not offer yet the possibility for users to customize it - mostly because once we will add Groups and Topics, the left sidebar will likely be rethinked a bit to properly include those as well...