Simple app build with Matlab 2021a

simple_app.m

function simple_app

    figMain = uifigure;
    figMain.Name = 'Simple app';
    
    % Main grid
    gridMain = uigridlayout(figMain, [1 2]); % 1 row, 2 columns
    gridMain.ColumnWidth = {350, '1x'};
    
    % Axes
    axesMain = uiaxes(gridMain);
    axesMain.Layout.Row = 1;
    axesMain.Layout.Column = 2;
    
    % Tabs
    tabGroup = uitabgroup(gridMain);
    tabGroup.Layout.Row = 1;
    tabGroup.Layout.Column = 1;
    tab1 = uitab(tabGroup, 'Title', 'Tab 1');
    tab2 = uitab(tabGroup, 'Title', 'Tab 2');
    
    % Grid for tab 1
    gridTab1 = uigridlayout(tab1, [2, 2]);
    gridTab1.ColumnWidth = {150, '1x'};
    
    % Number of points
    idxRow = 1;
    gridTab1.RowHeight{idxRow} = 22;
    labelNoPoints = uilabel(gridTab1);
    labelNoPoints.HorizontalAlignment = 'right';
    labelNoPoints.Text = '# points';
    labelNoPoints.Layout.Row = idxRow;
    labelNoPoints.Layout.Column = 1;
    editfieldNoPoints = uieditfield(gridTab1, 'numeric', 'RoundFractionalValues', 'on');
    editfieldNoPoints.Limits = [0 1e6];
    editfieldNoPoints.Value = 1000;
    editfieldNoPoints.Layout.Row = idxRow;
    editfieldNoPoints.Layout.Column = 2;
    
    % Plot button
    idxRow = 2;
    gridTab1.RowHeight{idxRow} = 22;
    button = uibutton(gridTab1);
    button.Layout.Row = idxRow;
    button.Layout.Column = [1 2];
    button.Text = 'Plot!';
    button.ButtonPushedFcn = @(src, event) plotPoints(axesMain, editfieldNoPoints.Value);

end

function plotPoints(hAxes, noPoints)

    X = rand(noPoints,3);

    cla(hAxes);
    scatter3(hAxes, X(:,1), X(:,2), X(:,3), 5^2, X(:,3));

end