For wider shots, a reflector is often less effective because it needs to be fairly close to the subjects to make a noticeable difference. If the group is small in the frame, it’s usually fine to let the faces run a little darker and brighten them in post; with small faces, a bit of extra noise is often acceptable. Bracketing can also help.

If you want fill on location, flash is usually more practical than a reflector at distance. One approach is to use one or more speedlights on a stand, either aimed into a large reflector for soft bounced fill or used directly as gentle fill.

If you want to stay reflector-only, use larger white boards or multiple reflectors rather than a single silver reflector, which gives a narrower beam. Two large white foam boards can provide broader, softer fill for a group, and two silver reflectors can be used to target different faces if you have enough help.

In short: for wide scenic shots, don’t rely on a small handheld reflector close-up style; use larger fill sources, flash, or plan to lift shadows in post.