Please find below more information about Sengi.
By default, Sengi doesn't need notification timelines: it has its own way to do it.
When your account will receive a new mention, follow, boost, favorite and other kind of notifications, your
avatar's icon will start flashing this way:
If you right-click on your avatar, the account panel will automatically open and switch to the related
subsection (mentions or notifications) and show you the last entries.
The flashing animation will then automatically stop:
The aim of this mechanism is to prevent the flood of notification timelines (one per account) in the interface,
especially if you add a lot of accounts in Sengi.
Of course, you can disable various parts of this mechanism in the settings like "disable avatar notification", "disable account's panel autofocus", etc.