how to hide L-shaped marks on the writer i got them on the head and bottem of the page
These are only visual hints about the currently active part in the page: here, the main text area.
These marks do not print and show only on screen. I suggest you keep them, like many others, as valuable help while composing your document. I recommend you also enable View>Formatting Marks which show even more important behind-the-scene data.
If, despite this advice, you still want to get rid of the mark, untick View>Boundaries.
PS: to get the most accurate answer, always mention OS name, exact LO version and save format. Taking your question as an example, display of boundaries changed in a rather recent release to settle on the kind in your screenshot.
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