I'm using Gnucash on MacOS and under the menu there is File->Export
which has options to export:
Account Tree to CSV
Transactions to CSV
Active Register to CSV
Accounts
But to be honest, if you want to migrate to another system, you could
look here:
https://lists.gnucash.org/docs/C/gnucash-guide/basics-migrate-settings.html
Which I found by typing "gnucash migrate to new system" into a search
engine.
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