Blank old command (in the older DOS program - PC DOS Editor

[shaharhada]

In this screenshot:
https://ibb.co/mBZ8YSD
There is command that Alt+A is ADJUST marked area, blank old
What is the meaning of the command?
What is blanking old?

 

[USAFRet]

This is from PC DOS 6.3, and the "E" editor.

"blank old" would presumably be to erase the previously selected text or command.

https://archive.org/stream/CoursewareN1740OS22.1ForSoftwareDevelopers/N1740 - OS2 2. 1 for Software Developers - Supplemental Material_djvu.txt

Of course, I could be completely wrong, and maybe someone else will chime in.

 

[JeffreyP55]

In this screenshot:
https://ibb.co/mBZ8YSD
There is command that Alt+A is ADJUST marked area, blank old
What is the meaning of the command?
What is blanking old?

Taught myself MS-DOS many years ago. Lessons were on a 5.25" floppy.
Anyway. https://www.lifewire.com/dos-commands-4070427