Is there a possibility to set the value of the resistor? It is difficult to choose a value of resistor changing only the L... I would like to set R and the software give me the L for a defined W...

If you need precise resistance values use res_xhigh_po. these resistors have a 2KOhm/square resistance, so it is easy to alculate the exact L for a given resistance. Currently the software does not allow to specify the resistance and calculate the L since the inverse is done. You give the L, the R is calculated. Keep in mind that the resistance shown is only an approximate value. The actual resistance depends on temperature, common mode voltage, size. This means for example that a 2/20 resistance is slightly different from a 1/10 resistance