Hi @Siniom and Welcome to the Community
!
I’ve got to ask
: What do you mean by “everyone” in this case ?
I’m asking because you could potentially envision a system where people would register as “Users” in in your doc and instead of using checkboxes to save their favourites from your [Favourites]
table, let them select options from a relation field …
(They wouldn’t necessarily need to register as users per se, but using a form, they could select options from the [Favourites]
table. Then, who selected what could be retrieved using CreatedBy())
E.g.:
In the screenshot below, at the bottom, I have the table [Favourites]
storing all the favourites available…
To its right I’ve created a [Users]
table where I’ve added myself (the user highlighted in blue) and my other self (
).
In the same table, I’ve added a manual multi-select relation field linking the [Favourites]
table to the [Users]
to be able to select any favourite I want … Which I did for both of my accounts 
When I added the [Favourites]
relation field in the [Users]
table, I’ve also added its linked relation field, gathering back who selected what as their [Favourites]
(so this info can be used later) 
Now, just above those 2 tables, there’s the filtered view of favourites ([View of Favourites]
) which will display the favourites by User() (the user currently looking at the doc) and if the toggle above is toggled ON
(otherwise, it won’t display anything in the view) using this formula :
If(MyFavourites,thisRow.Users.Any(User = User()) ,"")
The result is that depending on which account I use to view the doc, the [View of Favourites]
will only display the favourites tied to that specific account 
This is just an idea
and it might not fit your use case though
…