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I think you have Accessibilty Settings switched on. The "alien" looks like the icon that can magnify the screen.
Go to settings - accessibility -advanced settings - accessibility button and then switch all the options off.
A general guide here to Accessibility settings which are available on Samsung Devices https://www.samsung.com//support/mobile-devices/how-to-customize-accessibility-settings-on-your-gala...
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GBOne Ui 5.0,Android 13 .