Hi. Please check if you have activated:
View > Show > Selection edges.
View > Extras.
If that doesn't help, please try:
Resetting the tool: With the Rectangular Marquee tool selected, right-click in the first icon (close to the preset dropdown menu) in the Options panel and select "Reset Tool".
Resetting the preferences: https://helpx.adobe.com/photoshop/using/preferences.html#reset_preferences
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