Q: Macintosh HD displaying all memory as "other"

Rebuild Spotlight index on your Mac following these instructions:

https://support.apple.com/en-us/HT201716

Omni DiskSweeper can show you the precise size and location of all your files. It will inventory your disk starting from the files that take up the most space. It can also give you a more accurate read of disk space than Finder or Storage Tab of About this Mac. If you want you can even delete files from OmniDisk Sweeper. But be careful some of the items may be important to your system.

For information about the Other category see this Apple Support Topic

What is other?

https://support.apple.com/en-us/HT202867

Also look in Apple menu > About this Mac > Storage Tab

That display should not be relied upon because there is a bug in that program.  A Spotlight reindex is not necessarily a guarantee that it will correct it. 

Ciao.

AberUniStudent wrote:

I did the Spotlight remindex and nothing has changed.

If you reread by prior post, I indicated that might happen.

 

What do you mean by a bug in the programe?

Ciao.