MSP has Tables, Views, Groups, Filters and Reports etc (see all of them with
the Organiser).
A Table is a particular selection and arrangement of columns (fields),
usually only a small set from the many available (maybe 60 but I haven't
counted them)
Whenever you show or hide (insert/hide) columns, or even change the column
width, you are changing/editing that Table, and it will stay that way until
you change it again. Some changes such as column width are very minor (ie
have no important consequences) and necessary, but others should be done
sparingly and perhaps avoided altogether in favour of a different approach.
Inserting and Hiding columns ad-hoc can leave you with a Table which no
longer resembles the original, and you have lost whatever design and
functionality that the original had. It is better to create new Tables for
special purposes. It is better to leave the originals alone, and if
necessary recover the originals from the Global Template.
You can see what is controllable, or how a Table is defined, by View, Table,
More Tables and then create a new one or edit an existing one.
If you change a Table, say the Entry Table, in the Gantt Chart View you can
go to View, Table, More Tables and see how your changes have become part of
the Table definition.
This explanation about Tables also applies to Views, Groups, Filters and
Reports etc.
Don't change them very much.
If you do change them, recover the originals from the Global Template with
the Organiser.
If you want them different, make new ones, usually based on the most similar
built in one.
The Text and Bar formatting and all of Page Setup are stored by the View.
Since it is common to need to have a variety of formatting "sets" and
various Page Setups for different Headers and Footers etc, it is common to
need to create more Views. A View consists of a Group, a Filter, a Table and
a bunch of Formatting. So if you want a special View you will probably have
to make a a Group, a Filter, a Table to go with it.
Trevor