Not possible to change visible title in link field

I have created multiple datatypes.
When i try to link those to each other, i only see a random combination of characters instead of a logical name.
For this link, i use a link field to the other datatype.

I can’t find an option to change this.

Can anyone help me?

Set the naming series of doctype which is linked, if you leave it blank, it’ll start generating random strings.

There’s no such option by default, Link fields show name field of the linked table. You will have to implement custom modifications, to be able to show other fields.