We have heard the rumors before, saw the report from the reputable Korean media ETNews comes out as a confirmation of the upcoming Galaxy Z Fold3 and Z Flip3 screen sizes.
According to internal sources, the Galaxy Z Fold3’s external display will measure 6.23 “diagonally, while the internal, extended screen will go up to 7.55”. In other words, there will be no changes in size, just expect a more compact overall unit.
The Galaxy Z Flip3, on the other hand, gets a larger 1.9 “external screen that comes from 1.1” on the original Z Flip. The most important interior panel, however, remains at 6.7 “.
Other details were not mentioned, but we still have a little over a month until Samsung reveals both devices, so more rumors pop up until then.
Source (in Korean)