After using OpenOffice LibreOffice change view

Installed openoffice on ubuntu (previously removing LibreOffice). then uninstalled openoffice, installed LibreOffice back, but LibreOffice now looks the same as openoffice - Screenshot-from-2023-03-14-12-41-10 hosted at ImgBB — ImgBB . Why could this happen and what can be done to bring back the classic LibreOffice interface?

Tools - Options - View - Icon Style - choose one of the built-in sets, or install the desired set as Extension from the Extensions site.
The LO 7.x.y has a newer function: download an install a predefined icon set in one step from the Extension site:
Tools - Options - View - Icon Style - Add more icon themes…

It might be that installing LibreOffice after OpenOffice inherited and migrated that old configuration. Make sure to have LibreOffice closed and then remove any ~/.openoffice*/ or ~/.config/openoffice*/ (I don’t remember what it actually used) and ~/.config/libreoffice/ directories and content. Then start LibreOffice again, it should create ~/.config/libreoffice/4/ anew.
Also, installing libreoffice-gtk3 as mentioned by Vanadium might additionally be needed.

You did not indicate how you proceeded with these installations. If you would install the version of the distribution, it would look as expected.
The reason it looks not well integrated into the system may be because GTK integration is not installed. If that is the case, install that as well. How depends on how you installed LO in the first place. For the systemversion on Ubuntu, sudo apt install libreoffice-gtk3 does the trick, although it typically is installed automatically with LO. For the deb download, there is a dedicated package which used to be in a subdirectory of the unpacked tar archive.

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to install Libre I used the built-in Ubuntu Software

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