try to open file from source location

[ming tsang]

Dear lily Ponders

AA: When I try to run lilypond v2.23 by going to the source file and I got the following screen:

Both tabs display empty.

BB:   When I open up Frecobaldi v3.1.3 it displays as follows. I install v3.1.3 to day:

the tab shows as untitled. Then I did file-open-recent it shows:

Question: Why does it show different results (AA vs BB)? 

Thank you for helping.

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ming (lyndon) tsang