Hi @Yelena Zvereva,
Welcome to Microsoft Q&A!
Which version of Visual Studio are you using? Please update it to the latest version, create a new project and check that the Heap Size (Diff) column displays properly.
If it doesn’t work, please see the similar issue to check if you are using the Application Verifier and have GFlags enabled.
Sincerely,
Anna
If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment". Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.