New with OO Writer (can`t delete a frame)

Deal all,

Hi, everybody,

I generate a docx file from PDF for further editing (I use convert.world). After conversion, there are some fields (see screenshot) that I can’t reproduce on OO Writer. It’s more like a table, but I can’t edit or select them. How can I get rid of these tables by saving text in them?
image description

Upload a sample file. Screenshots often are useless.

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Guess: You can see a section (?). If yes, you may delete it (menu Format…). Normally there is no loss of content.