We see lots of questions on this topic in the Gmail Help Forum and in my opinion, this is one of the topics which requires some detailed explanation because there could be different reasons behind this. Your labels could be collapsed. We have previously discussed how the new Gmail comes with "collapsible" left panel label options. So, the first option is to check if that is why you are unable to view your labels. Here are the comparative screenshots of how the left panel looks when collapsed and expanded. If this is the case, simply clicking on the 3-bar option, as is indicated by the arrow in the second screenshot will allow the left-panel to remain expanded for your easy navigation. You need to scroll the Labels section or drag-down/hide the Hangouts Chat section. By default, the Hangouts Chat list is placed on the bottom-left corner of the screen, sharing the same panel with labels. You have three options to resolve this. (a) Use the scrollbar indicat...
I'm a Diamond Product Expert for Gmail and Google Accounts and this blog includes articles in English, Bengali and at times Hindi on new Gmail and Google Accounts feature launches or changes, Workarounds or explanations on issues affecting the users in the Gmail and Accounts Help Communities and documenting instructions I do not find in the Help Center articles.