Dungeons & Dragons: Tasha’s Cauldron of Everything (D&D Rules Expansion book): 1 (Dungeons & Dragons )

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In this case, you are likely using "Story-based advancement" (DMG 261) anyway, so the events that justify their "Sudden change" are also likely to be level breaks as well - although you can safely ignore whether or not the new level comes with a subclass feature.

Here it appears that the circumstances around which a "Sudden change" is justified also argue for allowing the change at any level. This feat grants a spellcaster one Eldritch Invocation from the warlock class, which they can change as they level up. However, the rule about only changing a subclass when gaining a new subclass feature is under the main section heading.Fathomless warlocks gain a swim speed, can breathe underwater, and gain a magical tentacle that can deal damage all starting at level 1. These are suggestions to help a DM facilitate a subclass change, which is a pretty significant change. Everytime I select the feat on my Wizard it doesnt have a little selection box, like the Martial Adept feat has.

This druidic circle allows you to harness the destructive power of nature through a bond with a primal spirit. These clerics gain proficiencies with martial weapons and heavy armor, and they can share their newfound darkvision with allies.which isnt bad at all (its a nice feat) but not really in line with what the article was talking about.

If you do want to allow a player to change their subclass, but you're not sure when to allow it or when might be a good time to have it happen, there's the first suggestion: "With your DM’s approval, you can change your subclass when you would normally gain a new subclass feature. If your table is in between, or has a mix of different playstyles from different players, consider how imposing or relaxing the subclass feature level requirement will affect the fun of both the specific player involved, and the rest of the table.Some gaming groups use both optional rules for maximum customizability, while other groups allow one, the other, or neither, to keep their game simpler or more focused. If they felt that was too long to wait, I would of course see how we could work a transition even sooner. Somewhat related: This question about a player who is not yet ready to make a subclass decision even though their character has leveled. As with the Psi Warrior, the Rune Knight is another highly anticipated part of Tasha’s Cauldron of Everything. The first paragraph under that section heading says that characters can change their subclass when they would normally gain a new subclass feature.