The operator panels for each logic element (except for data elements) are all constructed using the same principle. The first item is the setting (if available), then the inputs, then the output.
This shows you the selection of an input.
The button “select” lets you select the output of a different logic element that you wish to connect to this input.
The checkbox under “invert” lets you invert the input (if it is of type bool).
The checkbox under “fixed value” lets you allocate a fixed value to the input. This means that if you activate this checkbox, the type bool displays a checkbox in the centre with the text “value”. The state of the input can be controlled using this value. If you activate this checkbox for an input of data type number or string, then an input field appears where you can enter the desired value.