Can the 2020 Subaru Impreza make a U-turn?

Yes. Fits a 40 ft street.

35.4ft curb to curb

Street width, feet

Street 40 feet curb to curb.

2020 Subaru Impreza 2.0i Sedan AWD. Top view, to scale.

2020 Subaru Impreza: turning circle by trim, 40 ft street
Trim	Circle, ft	Margin	One move
2.0i Sedan AWD	35.4	+4.6 ft	Yes
4-door Manual AWD	35.4	+4.6 ft	Yes
2.0i Hatchback AWD	35.4	+4.6 ft	Yes
5-door Manual AWD	35.4	+4.6 ft	Yes
4-door CVT AWD	35.4	+4.6 ft	Yes
AWD	35.4	+4.6 ft	Yes
5-door CVT AWD	35.4	+4.6 ft	Yes
2.0i Premium Sedan AWD	35.4	+4.6 ft	Yes
Premium 4-door CVT AWD	35.4	+4.6 ft	Yes
Premium AWD	35.4	+4.6 ft	Yes
2.0i Premium Hatchback AWD	35.4	+4.6 ft	Yes
Premium 5-door CVT AWD	35.4	+4.6 ft	Yes
2.0i Sport Hatchback AWD	35.4	+4.6 ft	Yes
Sport 5-door Manual AWD	35.4	+4.6 ft	Yes
2.0i Sport Sedan AWD	35.4	+4.6 ft	Yes
Sport 4-door CVT AWD	35.4	+4.6 ft	Yes
Sport AWD	35.4	+4.6 ft	Yes
Sport 5-door CVT AWD	35.4	+4.6 ft	Yes
2.0i Limited Sedan AWD	35.4	+4.6 ft	Yes
Limited 4-door CVT AWD	35.4	+4.6 ft	Yes
Limited AWD	35.4	+4.6 ft	Yes
2.0i Limited Hatchback AWD	35.4	+4.6 ft	Yes
Limited 5-door CVT AWD	35.4	+4.6 ft	Yes

What this cannot tell you

Curb-to-curb turning circle as listed.

Mirrors and overhang need more room.