How to read some files which do not get along with LibreOffice Dark scheme

I have been using LibreOffice Dark scheme for a few months and there are no problems. Today I’d like to read a Writer file as shown in attached image. On the left is my file. On the right hand side is a downloaded .odt file, it did not work with LibreOffice Dark scheme. How can I read it normally ?
LibreOffice:
Version: 7.3.5.2 / LibreOffice Community
Build ID: 30(Build:2)
CPU threads: 4; OS: Linux 5.15; UI render: default; VCL: gtk3
Locale: en-US (en_US.UTF-8); UI: en-US
Ubuntu package version: 1:7.3.5-0ubuntu0.22.04.1
Calc: threaded
OS:
Ubuntu 22.04 LTS

Do you use documents whose original document templates are not subject to your current document template management?

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I have not created any templates for Writer. I saved and opened my file as shown on the left hand side, there was no problems.

Is this really a LO-dark theme or some dark theme from the OS?

LO themes are selected in Tools>Options, LibreOffice>Personalization.

If this is an OS-theme, the widget library (GTK+ for common GNOME Ubuntu) manages the theme directly and takes precedence over what could have been set by LO, except for some effects whose configuration is probed, such as font colour Automatic setting.

I know that dark themes are currently “in” but I consider them not suitable for office work. Of course, as usual for personal taste, your opinion may be different from mine.

EDIT
OS dark themes are usually designed by gamers who overlook implicit assumptions common in office work, such as high contrast between text and background. Consider also that white text on black background is less legible (in fact, negative text should always be rendered bold to improve readability, or at least strokes should be wider). Many text effect will render poorly in dark themes (examples: light gray or colour highlighting background, any formatting relying on the implicit paper sheet metaphor, …).

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OMG, yes, it is GNOME’s dark theme. So, I will edit that original file and save as a new file.