The ‘Signal Builder’ block has been removed R2023a onwards, instead the ‘Signal Editor’ block can be used.
Please refer to the documentation: https://www.mathworks.com/help/releases/R2023a/simulink/ug/migrate-from-signal-builder-block-to-signal-editor-block.html#mw_d2bb5cf3-9fa6-4a3d-9ae8-60e104c9a4e5
'Signal Builder' is now an obsolete block : https://www.mathworks.com/help/simulink/ref_obsolete_blocks/signalbuilder.html