Solved "Welcome to Mail" dialogue box Issue

Hi

Very often when I'm trying to contact an organisation online, a blue-coloured dialogue box appears on the screen, entitled: "Welcome to Mail", after which follows: "Add your accounts to keep up to date across devices". It looks suspiciously like a Microsoft product, but whatever it is or whose interests it's serving (not mine, that's for sure) I can't seem to get rid of it. Prompted by some online advice, I have gone into Task Manager/Startup, but can't see anything there that answers to the above name. I've also opened up the dialogue box itself just to see where it takes me, only to find myself not unexpectedly being asked to open up any number of new accounts, none of which I want. What is going on? More to the point, how do you disable this dialogue box?

My laptop runs on Win 10.

Hi, Yes, that's it, all right. My email account is Google Chrome.

Hi Rustys, many thanks for that. I'll give the link a go and see what happens.

Will do. . .

I'm afraid I'm still struggling with the above problem. I think the cause is due to having had my laptop's Google/Chrome account adapted to run via the Firefox web browser (there are fundamental reasons for this setup, the explanations of which are beyond my ability to explain. . . if that makes any sense). The upshot is that when I go into Settings, these turn out to be Firefox's, not Chrome's. I think I'll have to get our local PC menders to fix this problem "over the counter", so to speak. But the contributions to this thread have been very helpful. I've saved the links, and these will enable me to explain the problem in a far more cogent form than would otherwise be the case. Many thanks again.