If the laptop is offline, it will only show addresses 1 - 5... it will not be connected to the internet, so it will not be able to know to hide 1-5 and show 6-10. It will just show 1-5 and sit there.
In order to use an offline wallet, you need an online watch-only wallet counter part. This watch-only wallet has all your addresses, but it does NOT contain your seed. This way you will never get your bitcoins stolen from your online machine.
If you take a seed, like let's say
belly fate clutch pour flirt disguise baby alter rip quite law existence
and let's say you type that in to 100000000 different offline notebook PCs... it will show you the same addresses EVERY TIME.
If you copy the "Master Public Key" from the "Wallet" menu, and you use that Master Public Key to create a watch-only wallet, you will create the SAME EXACT ADDRESSES AS YOUR OFFLINE WALLET.
However, the online wallet will see the balances, so it will know which addresses to hide and which ones to show. (Electrum hides an address if it has any transactions in its history AND the current balance of that address is 0. Then it will hide the address.
Edit: if you want to check, the Master Public Key for the seed above is :
6836ca7cd1530300e92c719bfb0bdf74bdffaeb58c9b3c500bc12af6309e5ce89e10d97a927cc042c39f9d4fd1598e4c6cc73732286aaa11451a33f27a749cf8
And the first 50 addresses for the seed / master public key are below.
Try restoring the seed or master public key above and notice that they will always come out to the same first 5 addresses. If you want to see more addresses in your Receive group, just type in
wallet.storage.put('gap_limit', XX)
inside the Console tab, replace XX with the number of addresses you want to see... once you put it in, you have to close the wallet then open the wallet again. If you have a slow computer, showing more than 20 at a time can slow you down with generating addresses.
WARNING: THIS IS POSTED ON THE INTERNET, PLEASE DON'T ACTUALLY USE THIS SEED. YOUR BITCOINS WILL BE STOLEN.
1Jxau8jEq2WhuzMip2pT3er2ZbMU3Y3sTf
1p12G5PtksgufAGUnsQ6jSGsbSJJnJD9t
1JTdVNVDe9DmnSXhK3wDqejohappV8qspJ
1BYET2DA1AAukqX63gTssDzmPL9MxEJZqB
1GBVFhdDQGhJuJu9vPW8CDkskNzVMifpzj
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