Please introduce tabs in Adobe reader DC so that when we click the new tab button , it should open a OPEN dialogue and let user select file and open it in new tab . This would be really useful and adding vertical tabs and grouping tabs to it makes it even more attractive to use . For example , If i have 10 PDF open and 5 of them is my studies , I can create a group and put those 5 in the group and when i click on it , the files list can expand like normal.