I have several survey groups. How can I set that, my participants first see these categories after their Login, then select a desired group and consequently select a survey which belongs to the chosen survey-group.
First of all: Limesurvey does not have the availability of a login for survey takers. So you might have to program this outside of Limesurvey and then link to the respective surveys.
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Provide your LS version and where it is installed (own server, uni/employer, SaaS hosting, etc.).
Always provide a LSS file (not LSQ or LSG).
Note: I answer at this forum in my spare time, I'm not a LimeSurvey GmbH employee.