"Please take a look at the menu."
The standard position of 一下 is right after the verb, before the object.
I think this is one of the so-called "verbal measure words" or "AN for verbs." Other ones tell how many times the action happens. All come right after the verb.
Here's a note on the grammar, for anyone who's curious. https://resources.allsetlearning.com/chinese/grammar/Reduplication_of_verbs#Reduplication_with_.E4.B8.80_.28y.C4.AB.29