How to increase the number of master/slave fields in forms 2020?

[GNK]

A repeat of this:
How to increase the number of master/slave fields in forms?

… because typing in manually is broken (LO6.6 x64 win7 firebird) - just try to add a fifth link to replicate … I cant find an alternative solution

[Ratslinger]

Hello,

This does work in LO v7.0.1.2

Screen:

Property:

which has new multi-line editing (down arrow button).