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What you have done is, I assume (since it doesn't exactly match my "menubar" language) is a print setting. With the menubar (or right-click on page), it would be Format > Page... > Area [tab] > Colour > [choose colour], and that gives the printing area that background colour. So that only applies to the area inside the printing margins, like this example using blue:

This page will print out with a blue background and white margins.

What you want to use for screen reading/editing (and which leaves the printing of the page unaffected) is the . Go to Tools > Options... > [toggle] LibreOffice > Application Colours > General - Document Background - [choose colour]. (I don't know what the "path" for this will be in your ribbon layout, but it is the "program options" you want.) Setting the background to black then has this effect:

I've included some text in that screenshot so you can see that the text colour is automatically adjusted for your new "document background". The page will print with black text on white paper.

You can customize other application colours in the same way, if that is easier on your eyes. ;)

What you have done is, I assume (since it doesn't exactly match my "menubar" language) is a print setting. With the menubar (or right-click on page), it would be Format > Page... > Area [tab] > Colour > [choose colour], and that gives the printing area that background colour. So that only applies to the area inside the printing margins, like this example using blue:

This page will print out with a blue background and white margins.

What you want to use for screen reading/editing (and which leaves the printing of the page unaffected) is the . Go to Tools > Options... > [toggle] LibreOffice > Application Colours > General - Document Background - [choose colour]. (I don't know what the "path" for this will be in your ribbon layout, but it is the "program options" you want.)

Setting the background to black then has this effect:

I've included some text in that screenshot so you can see that the text colour is automatically adjusted for your new "document background". The page will print with black text on white paper.

You can customize other application colours in the same way, if that is easier on your eyes. ;)

What you have done is, I assume (since it doesn't exactly match my "menubar" language) is a print setting. With the menubar (or right-click on page), it would be Format > Page... > Area [tab] > Colour > [choose colour], and that gives the printing area that background colour. So that only applies to the area inside the printing margins, like this example using blue:

This page will print out with a blue background and white margins.

What you want to use for screen reading/editing (and which leaves the printing of the page unaffected) is the programme options. Go to Tools > Options... > [toggle] LibreOffice > Application Colours > General - Document Background - [choose colour]. (I don't know what the "path" for this will be in your ribbon layout, but it is the "program options" you want.)

Setting the background to black then has this effect:

I've included some text in that screenshot so you can see that the text colour is automatically adjusted for your new "document background". The page will print with black text on white paper.

You can customize other application colours in the same way, if that is easier on your eyes. ;)

What you have done is, I assume (since it doesn't exactly match my "menubar" language) is a print setting. With the menubar (or right-click on page), it would be Format > Page... > Area [tab] > Colour > [choose colour], and that gives the printing area that background colour. So that only applies to the area inside the printing margins, like this example using blue:

This page will print out with a blue background and white margins.

What you want to use for screen reading/editing (and which leaves the printing of the page unaffected) is the programme options. Go to Tools > Options... > [toggle] LibreOffice > Application Colours > General - Document Background - [choose colour]. (I don't know what the "path" for this will be in your ribbon layout, but it is the "program options" you want.)

Setting the background to black then has this effect:

I've included some text in that screenshot so you can see that the text colour is automatically adjusted for your new "document background". The page will print with black text on white paper.

You can customize other application colours in the same way, if that is easier on your eyes. ;)

Bonus - to alternate between the "menubar" and "ribbon" interfaces, go to: View > Toolbar > [Default|Notebookbar].