Change selected item in ListBox (Matlab App Designer)

Question

for a uni project, I have to create a GUI that processes EEG data. The data has already been processed by me but for the GUI we're supposed to work with unprocessed data. I'm working with three scenarios called 'Paradigma' in my code. current GUI I load the data of three different workspaces and assign them to each item in the ListBox seen on the right.

        % Button pushed function: loadDataButton
        function loadDataButtonPushed(app, event)
            app.ws1 = load('App/app_p1.mat');
            app.zeit = app.ws1.eeg_1;
            app.t = app.ws1.t_1;
            app.freq = app.ws1.EEG_1;
            app.f = app.ws1.f_1;
            app.F = app.ws1.F;

            app.ws2 = load('App/app_p2.mat');
            app.zeit = app.ws2.eeg_2;
            app.t = app.ws2.t_2;
            app.freq = app.ws2.EEG_2;
            app.f = app.ws2.f_2;
            app.F = app.ws2.F;

            app.ws3 = load('App/app_p3.mat');
            app.zeit = app.ws3.eeg_3;
            app.t = app.ws3.t_3;
            app.freq = app.ws3.EEG_3;
            app.f = app.ws3.f_3;
            app.F = app.ws3.F;
            
        end

  function ParadigmaAuswahlListBoxValueChanged(app, event)
            
            value = app.ParadigmaAuswahlListBox.Value;
            
            switch value
            case 'Paradigma 1'
            app.ws1;
            case 'Paradigma 2'
            app.ws2;
            case 'Paradigma 3'
            app.ws3;
            end

            
        end

Plotting the data works fine but I can't change the selected Paradigma from the ListBox once I've started working with any of the other. Unless I close and reopen the App of course.

I thought about adding the Button "neues Paradigma", that, if pressed "resets" the selections I've made. But so far I've only been able to clear the UIAxes. I don't really know what I'm doing so help would be appreciated. I also tried to add this at the end of the ParadigmaAuswahlListBox Function: app.ParadigmaAuswahlListBox.Value = {} but that obviously wouldn't work.