Hi, @Marie-Helene By replacing the code shown here, Google Analytics 4 in OJS3.3.x - #5 by yasielpv, the Google Analytics plugin will start working with Google Analytics 4 (GT) instead of working with Google Analytics Universal (UA). Only the GT code will be remain.
A solution to keep the data obtained with UA in the GT property is to link both properties from Google Analytics, and thus the previous data obtained by UA would not be lost, and the new ones would be obtained by GT