I usually prefer using the desktop mode myself, but if you wanna turn back, click on your pfp (located at the top right corner.). A drop down menu will appear. There will be an option called 'Mobile Ver.'. Click on that and you're done.
Also, another thing, after doing that, you'll be taken to the homepage. And when you try to go to the previous p...... reply
previous answer alr answered this question but i just wanna add, IF theres no option mobile version like this pict...
U can just log out, and sign back~~ everything will be back to normal.
but if its still not working then the browser app might be on des version (~‾▿‾)~ reply