Map Viewer : make a classified symbology with INT and Text data

[JasonBOCQUET]

Hi guys, I have a strange problem that I don't understand what is not possible to do.

I have a field about "number of employees" who is paremeter on integer with 10 fixed value. It's a INT field. (ie. Field 1)

I have a second field about "seniority" with modality like "A - less than 1 year", "B - between 1 and 5 years", etc. It's a Text field. (ie. Field 2)

My goal is very simple : i want to do a map with the Field 1 which manages the size of the points and the Field which manages the colour of the points.

For the ergonomics of my legend i want to classify my 10 values of the Field 1 and parameter for each value the size of the point and the name of each class (exemple "A. More than 1000 employees").

But, i'm confronted to one problem : when i choice my fields like here :

I can set the Field 2 with colour without problem but i can't classify the size :

I'm forced to use this strange tool who handles size terribly.

So my question here is simple : how can i make a classified symbology by using both of my data typed on integer and text ?

Thanks