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I believe that they will go where they want (and may be trainable to stay out) but often just follow their beaks while they forage so the rabbit fence acts as a guide
If there are plenty of "OK" places they don't necessarily feel a need to go to the "Not OK" places. But mine do like shade in the noonday sun so if the only place a chicken has to get out of the sun (besides the coop which mine do NOT use during the day) other than the "not OK" places they will be in there.
Mine have made 2 outside dust bath spots. On near a lilac bush (and yes the small plants there are gone) and one under the picnic table which is over a spot where there is no grass because there was stuff piled there for a couple of years. Other than that, they don't mess in the flower beds other than fall and spring when nothing is growing.