Click your circular display picture in the top right corner of your screen (must be logged in) to access the Settings dropdown menu.

Select "Collaborate".

Hover your cursor over the user whose timezone settings you would like to adjust, then click the green pencil symbol.

From here, you can use the Global Timezone dropdown to adjust the timezone settings for all profiles. Alternatively, you can adjust the timezone for individual profiles in the rightmost column of the profiles table.
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​Note: This will adjust the timezone for the selected user only.
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Click "Save Changes".