The My Timesheet matrix can be added to the Home tab, on standalone Lightning Pages, and on pages within your Experiences / Communities and allows Resources to track their hours where it’s most convenient.
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This matrix will only show assignments that have been assigned to Resources related to the current logged-in user. Resources are related to a user via the User lookup field on the Resource detail page.
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In addition to the provided My Timesheet matrix, custom standalone matrixes can be created by leveraging the ViewUserAssignmentsOnly and StandaloneUserMatrix matrix parameters. Details can be found here: Create a Custom Matrix.