GIT REBASE after GIT MERGE - why delete does not work and how to use it in the future?

Question

git

Let's say there are such commits

A - B - C - D  -  -  (M)
             \       /
               X - Y

After the merge in the history it turns out A - B - C - D - X - Y - M
1) How to do git merge so that the commits of the second branch are not taken into account? Those. only A - B - C - D - M, and the commits X - Yare gone.
2) How to delete X - Yin the current state?
I do git rebase -i master
The editor opens with the line noop
I remove noop and enter

d X
d Y

where X and Y are hashes of extra commits
Returns success, but the history does not change.