Hotkeys are an easy way to navigate within filters in the LMS. Previously, clients could use the Enter key to navigate from one filter to the next. In keeping with Web Content Accessibility Guidelines (WCAG), this has been changed so that users must now use the Tab key instead of the Enter key to navigate between filters. These guidelines require confirmation for changes made to data that is displayed and that user action is required in order for the page to move focus from one field to another. Using the Tab key satisfies these requirements.
When navigating between filters, the currently selected filter will be highlighted in blue on the page.
You can read more about WCAG here.