Question

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What is the difference between the following
commands:

(i) Edit Delete Contents → Delete all and
Edit → Delete Contents → Text

(ii) Edit Delete Contents → Text and
Edit Delete Contents Formats
(iii) Edit Delete Contents → Text and
Edit Delete Contents → Notes​

Answer 1

I will refer to them as ‘arguments’ versus ‘braced groups’.

If you're not aware which construct is in force, then you can get unexpected results.

The examples below should clarify.

ARGUMENTS:

In this documentation, arguments are indicated by #1, #2, etc.

An argument is either a single ‘token’ (like ‘a’ or ‘\alpha’), or is a group enclosed in braces.

For example, the \boldsymbol command takes an argument, notated by:

Answer 2

REFER TO THE ATTACHMENT