> Dario C Thu, 04 Nov 2021 03:43:08 -0700 > > Is there any way to stop calculation, write and re-launch calculation, in > order to write smoothly? Hi Dario, have you tried to comment out the expression, modify it and then uncomment it out? https://docs.qgis.org/3.22/en/docs/user_manual/expressions/expression.html#the-interface Regards. Andrea