Are you wanting to reflect this change in the citations or in the bibliography? - With the setting you are showing, it would affect the citations, and you only have 1, 2 or 1 et al displayed according to your settings. You also have a space in front of the last semi-colon, which should probably not be there.
the citations are showing for me, with those settings (started with APA 6th):
(Pawluk, 2018; Pedersen et al., 2018; Prieto et al., 2018; Qian et al., 2018; Rossant and Tam, 2018; Smith et al., 2018; Tettey et al., 2018; Wang et al., 2018; Wu et al., 2018; Xiong et al., 2018)
And author (year)
Meyer et al. (2018); Nimmagadda et al. (2018)
You need to do this for the bibliography settings and you would need to see more than the 2 authors to get any of those semi-colons to show?