Try the available controls
Use desktop preferences for Quiet motion and text size, and Settings → Theme Store for a readable theme. Report any control you cannot reach by keyboard.
Describe the barrier
Include the affected screen, build, keyboard steps and assistive technology version. Explain what you expected to hear or see and what occurred.
Send feedback
Use #accessibility-feedback in Sauce Canary or a private support request. Attachments are optional. Remove names, messages and other personal information unrelated to the issue.