Whether you just closed a tab accidentally or have one in the back of your mind you need back, Command + Shift + T can get it back. Press it once to reopen your last closed tab, and keep pressing it ...
If you decide to spill the results, you can then use the spilled range operator (#) to perform a calculation on the spilled range. Simply reference the first cell of the spilled range with a # ...
The AMD Ryzen 7 7730U processor has eight cores so you can run a lot of demanding programs at once without your laptop ...