Conext menu behaviour change in SSMS 18.0/18.1
While I cannot reproduce this problem (i.e. I can right-click on any item in Object Explorer and press ⇧ once to get to the bottom of the menu in SSMS 18.0 RTM), if the goal is to reduce the number of times you press a key, then I will suggest abandoning the desired approach (2 keys pressed: ⇧ and then Enter ↲) in favor of simply doing a left-click and then pressing F5 once (i.e. "Refresh"), thereby saving one key-press every time &#x1F63A;.