When I try to search odt file content in Writer I get no results.

I usually press “open file”, search a certain file folder, type a word or phrase and get suggestions for relevant files. The problem occured on my new computer. I had to import all my files from my old computer. Afterwards I started indexing in Win 10. Still no change at all.
My LibreOffice Version is 6.0.7.3 (x64).
Any suggestions what I can do?

It is possible that your new computer made an incorrect program mapping for the ODT files. You should change this once for ODT files. How to do it is described here.

If my answer did solve your problem, please click the big checkmark inside the circle to the left of this answer.

EDIT_1_20181213-13.45h

How did you “import” your files? Please describe the individual steps. Do the files on the new computer have the same file size as the “old one”? Can you anonymize one of your files and upload it here? Upload: Edit your question and click on the icon “Attachment”. Follow the instructions.

Thank you for your reply. However, the odt-files are assigned to LibreOffice.

See my edited answer.