user100375: I have used electrum for many years on my desktop pc, and have alway felt very secure in doing so because of my ability to use a very strong password to encrypt my seed phrase with. However I just started using the android version and have some concerns.
The android version requires me to select a PIN but it is only 6 digits long? How does the android version of electrum ensure that this tiny keyspace (1 million) stays secure?

user63872: 
The android version requires me to select a PIN but it is only 6 digits long? How does the android version of electrum ensure that this tiny keyspace (1 million) stays secure?

The PIN is not used as a master seed in this way. It may be used as an additional source of user-supplied entropy, but the wallet's seed will be generated in a cryptographically secure way, using other sources of randomness to provide sufficient security. 
I am unfamiliar with the specifics of Electrum's implementation, but there are generally two possibilities here:
1) the password / PIN is simply used to encrypt the wallet, and is not used as input for the seed 
2) the password/ PIN is used as a '13th/25th word' that acts as a password on the mnemonic. Find more info here. Also, from BIP 39: 

A user may decide to protect their mnemonic with a passphrase. If a passphrase is not present, an empty string "" is used instead.


user5273: Edit 15/3/2021: Electrum now lets you set a longer password.
Android is also better at keeping apps from stepping on each other's toes. The OS isolates Electrum's files and prevent other apps from accessing them.

100375: <p>I have used electrum for many years on my desktop pc, and have alway felt very secure in doing so because of my ability to use a very strong password to encrypt my seed phrase with. However I just started using the android version and have some concerns.</p>

<p>The android version requires me to select a PIN but it is only 6 digits long? How does the android version of electrum ensure that this tiny keyspace (1 million) stays secure?</p>
 63872: <blockquote>
  <p>The android version requires me to select a PIN but it is only 6 digits long? How does the android version of electrum ensure that this tiny keyspace (1 million) stays secure?</p>
</blockquote>

<p>The PIN is not used as a master seed in this way. It may be used as an additional source of user-supplied entropy, but the wallet's seed will be generated in a cryptographically secure way, using other sources of randomness to provide sufficient security. </p>

<p>I am unfamiliar with the specifics of Electrum's implementation, but there are generally two possibilities here:</p>

<p>1) the password / PIN is simply used to encrypt the wallet, and is not used as input for the seed </p>

<p>2) the password/ PIN is used as a '13th/25th word' that acts as a password on the mnemonic. Find <a href="https://bitcoin.stackexchange.com/questions/72016/what-is-the-25th-word-in-a-mnemonic-seed-when-used-on-a-ledger-nano-s">more info here</a>. Also, <a href="https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki" rel="nofollow noreferrer">from BIP 39:</a> </p>

<blockquote>
  <p>A user may decide to protect their mnemonic with a passphrase. If a passphrase is not present, an empty string "" is used instead.</p>
</blockquote>
 5273: <p>Edit 15/3/2021: Electrum now lets you set a longer password.</p>
<p>Android is also better at keeping apps from stepping on each other's toes. The OS isolates Electrum's files and prevent other apps from accessing them.</p>
