I saw this posted recently in one of the Facebook genealogy or DNA groups I belong to, but I hadn’t checked it out on FamilyTree DNA (FTDNA) until today. Go to https://www.familytreedna.com/ and log in. Once you log-in, the direct link to the Chromosome Browser is: https://www.familytreedna.com/my/family-finder/chromosome-browser. It says I can select up to 7 of my DNA matches.
I checked the FTDNA Learning Center and found more information: https://www.familytreedna.com/learn/user-guide/family-finder-myftdna/chromosome-browser/. You can browse through the link for more information. I re-blogged a post by Roberta Estes (DNA-Explained.com): https://upsdownsfamilyhistory.wordpress.com/2018/10/18/family-tree-dnas-new-chromosome-browser-dnaexplained-genetic-genealogy/.