The LibreOffice is using my dedicated video card NVidia Geforce GT540M and is increasing the temperature of my notebook.
I find it very strange and unnecessary, because I never saw office applications have to use the dedicated graphics card.
Word processor, spreadsheet, etc., do not require a dedicated card. It is different from what happens when we use Photoshop or AutoCAD, for example.
Remembering that I did not set up for this to happen, as LibreOffice is not set on the video board panel as an application that requires the dedicated video.