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I propose to add a way to organize tables by groups as MS Access does.
Currently tables in a base are organized by tabs in a row on the top. I understand that this would be against the Excel-like feeling, where the workbook is organized in sheets, which are actually tabs. But I think MS Access way to organize the tables in groups is much better.
This feature would get bases much more organized. For example I would create the following organization for my tables:
1) Entities groups. In each of these groups, I would put just the entities which I am dealing with to model my universe (for example, Student, Tuition for a school or Order, item for a procurement etc.)
2) Lookup Tables. All lookups that cannot be implemented with a single field dropdown list. For example a ROLE table which requires a field like Title, but also a description and maybe other fields like Hourly Rate etc.
3) Many-to-Many associations Tables. For all associations that need to be materialized, because you need to record information for each association. For example, when you assign a parking to a car. The association table is the place where to store the arrival date/time and departure.
Table types 2 and 3 are quickly proliferating and pollute the data model led by the tables that deal with pure entities.
I would suggest to implement it as a toggle to the interface, so that the users could switch between the two layouts as they wish. Excel-like (tabs in a row) or Access-like (groups of tabs in a side column).
MS Access actually adopts this way to organize multiple tables.
Airtable users who works directly with tables and base designer.