ThunderbirdPortable - Order in dowloading e-mails from several accounts.

Dear,

since some weeks ago my ThunderbirdPortable installed on my USB Drive used to download e-mails from my four accounts following an order I liked: first my main account, then the others.

But now the order is changed, and my main account "slid down".

Seems a tiny matter, but this quite slows down the whole operation...

How can I come back to the previous order, or better control this order? Maybe something in the config sheet?

Thanks.

p.s. On the page dedicated to the Accounts (maybe "Account Options" or something similar, in Italian is "Impostazioni Account...") the accounts are well ordered: first the main, the the others.