If you're a teacher in Moodle, then this page will tell you about the major changes affecting you in Moodle 4.3.
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Activity cards redesign
Streamlined cards
Narrower activity cards with smaller icons.
Access completion conditions from a dropdown menu.
Show more/less
Neater display of Show more/less links for restrictions
Edit links for direct access to settings
Teachers have Edit links taking them directly to the relevant completion or restriction settings.
Group icons for teachers
A group icon displays on hover for activities allowing groups.
Group mode
A modal window gives teachers quick access to group mode settings.
New Availability setting
From 'More' a new setting allows easy editing of availabilty options.
Edit availability
Teachers can quickly edit availability settings from the relevant item.
Course communication
Matrix as an integrated provider
Admins can enable Matrix as a communication provider for teachers to use in courses.
Quick link to rooms
A quick link to new or existing rooms enhances course communication.
MoodleNet sharing improvements
Share courses
Teachers can share courses or parts of courses to MoodleNet.
MoodleNet Share progress page
A new page shows the progress of course and activity uploads.
LTI External tools
Add tools more easily in courses
Significant refactoring to LTI External tools simplify their use for course teachers.
Control display in Activity chooser
Teachers can specify which tools will display for selection in the Activity chooser.