welcome to the notepad++ community, @Konrad-Bińko
please test the following, to verify, if a clean notepad++ would show html and xml language selections on your system:
download the notepad++ 7.6.6. 64 bit portable version from >>> here <<<.
(the portable version does not require any installation and runs completely independent and isolated from your installed version. all custom settings, as well as any stuff you might want to try at the portable version, will not modify your installed version)
extract npp.7.6.6.bin.x64.zip to e.g. your desktop.
important note: make sure to close all instances of notepad++ that might be running, before starting the portable version at the next step, to make sure you are using the portable version for this test.
open the extracted npp.7.6.6.bin.x64 folder and start this portable version by double-clicking on notepad++.exe inside this folder.
(note: notepad++.exe will just be seen as notepad++, if you have activated to hide all known file extensions at your windows explorer settings)
test if html and xml selections, as well as css, are shown at the alphabetically cascaded language menu.
if this portable version works for you as expected, please provide us with the debug information of your installed notepad++, by going to the menu ? > debug info... > copy debug info into clipboard and pasting it here, for further guides and fixes.